Weak LP Relaxation - Best Bound Does Not Improve

I'm working on an Asymmetric Traveling Salesman Problem (ATSPP) variant where the objective is to minimize the total revisit span rather than travel time. The problem involves visiting nodes (start terminal > ‘link clusters’ > end terminal) on a street network, where some link cluster nodes form pairs on opposite sides of the same street. The revisit span measures the time difference between visiting the link cluster pairs.

These are the basic TSP constraints that I am using:

Besides these basic constraints, I have implemented arrival time propagation constraints using arc-specific bigMs as well as the linearisation of the revisit span.

which is notated in mathematical formulation as (where Ei is the earliest arrival time, Li the latest arrival time):

If i run this on a 30 node problem, the best bound does not improve anymore. I have added the output logs at the end of this message. Which parameter settings are recommended to improve this? And are there any other formulations possible to improve this? 

Set parameter TimeLimit to value 900
Gurobi Optimizer version 12.0.3 build v12.0.3rc0 (win64 - Windows 11+.0 (26200.2))

CPU model: Intel(R) Core(TM) i7-8650U CPU @ 1.90GHz, instruction set [SSE2|AVX|AVX2]
Thread count: 4 physical cores, 8 logical processors, using up to 8 threads

Non-default parameters:
TimeLimit  900

Optimize a model with 3021 rows, 1075 columns and 10819 nonzeros
Model fingerprint: 0x67f3d9f2
Model has 8 simple general constraints
 8 ABS
Variable types: 82 continuous, 993 integer (993 binary)
Coefficient statistics:
 Matrix range     [1e+00, 9e+03]
 Objective range  [1e+00, 1e+00]
 Bounds range     [1e+00, 1e+04]
 RHS range        [1e+00, 1e+04]
Presolve added 0 rows and 20 columns
Presolve removed 14 rows and 0 columns
Presolve time: 0.06s
Presolved: 3007 rows, 1095 columns, 10714 nonzeros
Variable types: 95 continuous, 1000 integer (1000 binary)
Found heuristic solution: objective 4114.0000000
Found heuristic solution: objective 3330.0000000

Root relaxation: objective 8.020000e+02, 404 iterations, 0.01 seconds (0.01 work units)

   Nodes    |    Current Node    |     Objective Bounds      |     Work
Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time

    0     0  802.00000    0   23 3330.00000  802.00000  75.9%     -    0s
    0     0  802.00000    0   75 3330.00000  802.00000  75.9%     -    0s
    0     0  802.00000    0   64 3330.00000  802.00000  75.9%     -    0s
H    0     0                    3129.0000000  802.00000  74.4%     -    0s
    0     0  802.00000    0   22 3129.00000  802.00000  74.4%     -    0s
    0     0  802.00000    0   24 3129.00000  802.00000  74.4%     -    0s
H    0     0                    3076.0000000  802.00000  73.9%     -    0s
    0     0  802.00000    0   26 3076.00000  802.00000  73.9%     -    1s
    0     0  802.00000    0   23 3076.00000  802.00000  73.9%     -    1s
    0     0  802.00000    0   21 3076.00000  802.00000  73.9%     -    1s
H    0     0                    3129.0000000  802.00000  74.4%     -    0s
    0     0  802.00000    0   22 3129.00000  802.00000  74.4%     -    0s
    0     0  802.00000    0   24 3129.00000  802.00000  74.4%     -    0s
H    0     0                    3129.0000000  802.00000  74.4%     -    0s
    0     0  802.00000    0   22 3129.00000  802.00000  74.4%     -    0s
    0     0  802.00000    0   24 3129.00000  802.00000  74.4%     -    0s
H    0     0                    3129.0000000  802.00000  74.4%     -    0s
    0     0  802.00000    0   22 3129.00000  802.00000  74.4%     -    0s
H    0     0                    3129.0000000  802.00000  74.4%     -    0s
H    0     0                    3129.0000000  802.00000  74.4%     -    0s
    0     0  802.00000    0   22 3129.00000  802.00000  74.4%     -    0s
    0     0  802.00000    0   24 3129.00000  802.00000  74.4%     -    0s
H    0     0                    3076.0000000  802.00000  73.9%     -    0s
    0     0  802.00000    0   26 3076.00000  802.00000  73.9%     -    1s
    0     0  802.00000    0   23 3076.00000  802.00000  73.9%     -    1s
    0     0  802.00000    0   21 3076.00000  802.00000  73.9%     -    1s
    0     0  802.00000    0   51 3076.00000  802.00000  73.9%     -    1s
    0     0  802.00000    0   25 3076.00000  802.00000  73.9%     -    1s
    0     0  802.00000    0   24 3076.00000  802.00000  73.9%     -    1s
    0     0  802.00000    0   23 3076.00000  802.00000  73.9%     -    1s
    0     0  802.00000    0   23 3076.00000  802.00000  73.9%     -    1s
H    0     0                    2643.0000000  802.00000  69.7%     -    2s
    0     2  802.00000    0   22 2643.00000  802.00000  69.7%     -    2s
    0     0  802.00000    0   23 3076.00000  802.00000  73.9%     -    1s
    0     0  802.00000    0   23 3076.00000  802.00000  73.9%     -    1s
H    0     0                    2643.0000000  802.00000  69.7%     -    2s
    0     2  802.00000    0   22 2643.00000  802.00000  69.7%     -    2s
H  172   173                    2009.0000000  802.00000  60.1%  41.7    2s
H  249   324                    1763.0000000  802.00000  54.5%  34.1    3s
H  354   324                    1726.0000000  802.00000  53.5%  29.6    3s
 1089   955  802.00000   61   51 1726.00000  802.00000  53.5%  27.5    5s
 1644   967 1419.00000   53   25 1726.00000  802.00000  53.5%  25.5   10s
H 1645   919                    1427.0000000  802.00000  43.8%  25.5   11s
 1769  1010  802.00000   22   29 1427.00000  802.00000  43.8%  41.0   15s
 2159  2007  802.00000   45   38 1427.00000  802.00000  43.8%  41.5   21s
 1089   955  802.00000   61   51 1726.00000  802.00000  53.5%  27.5    5s
 1644   967 1419.00000   53   25 1726.00000  802.00000  53.5%  25.5   10s
 1089   955  802.00000   61   51 1726.00000  802.00000  53.5%  27.5    5s
 1644   967 1419.00000   53   25 1726.00000  802.00000  53.5%  25.5   10s
H 1645   919                    1427.0000000  802.00000  43.8%  25.5   11s
H 1645   919                    1427.0000000  802.00000  43.8%  25.5   11s
 1769  1010  802.00000   22   29 1427.00000  802.00000  43.8%  41.0   15s
 2159  2007  802.00000   45   38 1427.00000  802.00000  43.8%  41.5   21s
 3186  1763  821.00000   65   34 1427.00000  802.00000  43.8%  43.6   25s
H 3307  2246                    1421.0000000  802.00000  43.6%  43.4   26s
H 3893  1961                    1181.0000000  802.00000  32.1%  42.2   26s
 5319  3327  802.00000  112   27 1181.00000  802.00000  32.1%  38.8   30s
12048  6942 infeasible  205      1181.00000  802.00000  32.1%  26.8   35s
14913  8902  802.00000   47   39 1181.00000  802.00000  32.1%  25.1   40s
H17495  8017                     950.0000000  802.00000  15.6%  23.6   41s
19403  9122 infeasible  156       950.00000  802.00000  15.6%  22.7   45s
H19405  8274                     883.0000000  802.00000  9.17%  22.7   45s
24734 10677  802.00000   81   34  883.00000  802.00000  9.17%  21.4   50s
29301 13414  802.00000  172   31  883.00000  802.00000  9.17%  20.4   63s
29933 14280 infeasible  113       883.00000  802.00000  9.17%  20.5   65s
33764 14354  802.00000  117   32  883.00000  802.00000  9.17%  19.8   70s
39249 15943  802.00000  170   50  883.00000  802.00000  9.17%  19.1   75s
44218 18243  802.00000  133   26  883.00000  802.00000  9.17%  18.6   81s
53084 18614  802.00000  137   33  883.00000  802.00000  9.17%  17.7   85s
56575 19897  802.00000  122   27  883.00000  802.00000  9.17%  17.7   90s
57214 20184  872.00000  158   26  883.00000  802.00000  9.17%  18.0   95s
63604 22777  823.00000   69   20  883.00000  802.00000  9.17%  17.6  100s
70591 24404 infeasible  102       883.00000  802.00000  9.17%  17.4  105s
70736 24536  802.00000   93   37  883.00000  802.00000  9.17%  17.5  110s
74192 25488  815.00000  113   25  883.00000  802.00000  9.17%  17.6  116s
74192 25488  815.00000  113   25  883.00000  802.00000  9.17%  17.6  116s
74696 25663 infeasible  106       883.00000  802.00000  9.17%  17.7  122s
75430 27095  802.00000  134   27  883.00000  802.00000  9.17%  18.0  125s
88372 27810 infeasible  131       883.00000  802.00000  9.17%  17.2  130s
96491 28367 infeasible  134       883.00000  802.00000  9.17%  16.9  135s
H96757 28174                     877.0000000  802.00000  8.55%  17.0  136s
99297 29792  802.00000   94   29  877.00000  802.00000  8.55%  17.1  140s
103305 32725  802.00000  133   26  877.00000  802.00000  8.55%  17.0  146s
111916 33941  802.00000  184   33  877.00000  802.00000  8.55%  16.8  150s
117327 35673  802.00000  107   28  877.00000  802.00000  8.55%  16.5  155s
123521 36996  802.00000  162   28  877.00000  802.00000  8.55%  16.3  160s
123805 37067  802.00000  171   23  877.00000  802.00000  8.55%  16.4  165s
127833 38353  802.00000   86   23  877.00000  802.00000  8.55%  16.4  170s
133306 39081 infeasible  109       877.00000  802.00000  8.55%  16.3  175s
137448 39621  802.00000   72   33  877.00000  802.00000  8.55%  16.2  180s
139143 39839 infeasible  129       877.00000  802.00000  8.55%  16.3  185s
143301 40537  802.00000  129   30  877.00000  802.00000  8.55%  16.3  190s
147683 41744  833.12619  145   26  877.00000  802.00000  8.55%  16.3  195s
149386 42851  802.00000   70   29  877.00000  802.00000  8.55%  16.2  201s
158137 43952  802.00000   76   27  877.00000  802.00000  8.55%  16.3  205s
162175 44834 infeasible   84       877.00000  802.00000  8.55%  16.3  210s
165343 46271 infeasible  114       877.00000  802.00000  8.55%  16.3  217s
173532 46280     cutoff   96       877.00000  802.00000  8.55%  16.2  220s
173678 46291  802.00000  110   35  877.00000  802.00000  8.55%  16.2  225s
173916 46285  808.00000  116   28  877.00000  802.00000  8.55%  16.2  230s
174675 46555  802.00000   79   25  877.00000  802.00000  8.55%  16.3  235s
176961 47685  841.00000  129   17  877.00000  802.00000  8.55%  16.4  240s
180308 49498 infeasible  102       877.00000  802.00000  8.55%  16.4  247s
188613 49459 infeasible  115       877.00000  802.00000  8.55%  16.2  250s
191321 49978  802.00000   93   26  877.00000  802.00000  8.55%  16.2  255s
194368 50751 infeasible  133       877.00000  802.00000  8.55%  16.2  260s
199497 51864 infeasible  125       877.00000  802.00000  8.55%  16.2  265s
205203 53417  802.00000  135   24  877.00000  802.00000  8.55%  16.2  270s
209851 54780  802.00000  145   20  877.00000  802.00000  8.55%  16.2  275s
217180 55989 infeasible  146       877.00000  802.00000  8.55%  16.1  280s
222511 57566 infeasible  142       877.00000  802.00000  8.55%  16.1  285s
223053 57972  833.00000  136   30  877.00000  802.00000  8.55%  16.2  290s
231877 59870 infeasible  122       877.00000  802.00000  8.55%  16.2  295s
235249 60685  802.00000   99   25  877.00000  802.00000  8.55%  16.2  300s
239619 62528  802.00000  151   25  877.00000  802.00000  8.55%  16.3  306s
247090 63032  809.00000  165   27  877.00000  802.00000  8.55%  16.3  310s
252029 63680  802.00000  124   31  877.00000  802.00000  8.55%  16.3  315s
253152 63770  802.00000  133   27  877.00000  802.00000  8.55%  16.4  320s
259423 64098  802.00000  145   29  877.00000  802.00000  8.55%  16.4  325s
264632 66008  802.00000  103   27  877.00000  802.00000  8.55%  16.4  330s
269779 67520 infeasible  130       877.00000  802.00000  8.55%  16.3  337s
276578 67508 infeasible  125       877.00000  802.00000  8.55%  16.2  340s
276799 67505  802.00000   84   31  877.00000  802.00000  8.55%  16.2  345s
277769 67524  802.00000   98   24  877.00000  802.00000  8.55%  16.3  350s
278559 67979  848.00000  139   24  877.00000  802.00000  8.55%  16.4  355s
284290 68312 infeasible   94       877.00000  802.00000  8.55%  16.3  360s
292474 68997  817.00000   82   24  877.00000  802.00000  8.55%  16.2  365s
296754 69553  802.00000  115   24  877.00000  802.00000  8.55%  16.2  370s
299566 70951  802.00000  105   32  877.00000  802.00000  8.55%  16.3  377s
306832 70914 infeasible  107       877.00000  802.00000  8.55%  16.1  380s
311375 71633  802.00000   80   28  877.00000  802.00000  8.55%  16.1  385s
316068 72023  802.00000  105   27  877.00000  802.00000  8.55%  16.1  390s
319620 72647  802.00000   78   28  877.00000  802.00000  8.55%  16.1  395s
322432 73198  804.00000   88   27  877.00000  802.00000  8.55%  16.1  400s
326572 74025 infeasible  100       877.00000  802.00000  8.55%  16.1  405s
326950 74091  802.00000  124   27  877.00000  802.00000  8.55%  16.2  410s
328501 74586  802.00000   90   29  877.00000  802.00000  8.55%  16.2  438s
333954 75956  848.00000  122   22  877.00000  802.00000  8.55%  16.5  443s
341937 75959  802.00000   93   24  877.00000  802.00000  8.55%  16.4  445s
342008 76202  802.00000   93   28  877.00000  802.00000  8.55%  16.4  450s
347666 76757  802.00000   86   29  877.00000  802.00000  8.55%  16.3  455s
352731 77419 infeasible   92       877.00000  802.00000  8.55%  16.3  460s
356438 78168  802.00000   90   24  877.00000  802.00000  8.55%  16.3  465s
358032 78828  802.00000   79   34  877.00000  802.00000  8.55%  16.3  470s
363299 79180  802.00000   94   28  877.00000  802.00000  8.55%  16.3  475s
368270 79966 infeasible  103       877.00000  802.00000  8.55%  16.3  480s
371661 80905  802.00000   85   28  877.00000  802.00000  8.55%  16.3  485s
376609 81449  802.00000  112   24  877.00000  802.00000  8.55%  16.2  490s
380376 82081 infeasible  110       877.00000  802.00000  8.55%  16.2  495s
385448 83370  802.00000  122   28  877.00000  802.00000  8.55%  16.2  500s
388056 83826 infeasible  117       877.00000  802.00000  8.55%  16.2  513s
395910 83974  802.00000   78   27  877.00000  802.00000  8.55%  16.3  515s
402832 84908 infeasible  139       877.00000  802.00000  8.55%  16.2  520s
402999 85218  802.00000  108   28  877.00000  802.00000  8.55%  16.2  525s
409695 85519  802.00000   71   34  877.00000  802.00000  8.55%  16.2  530s
412813 86417  802.00000  101   22  877.00000  802.00000  8.55%  16.2  535s
418145 87542 infeasible  106       877.00000  802.00000  8.55%  16.2  540s
425232 89100 infeasible  128       877.00000  802.00000  8.55%  16.1  545s
430303 90407 infeasible   84       877.00000  802.00000  8.55%  16.1  550s
432825 91949  802.00000  135   23  877.00000  802.00000  8.55%  16.2  556s
440455 91918 infeasible  137       877.00000  802.00000  8.55%  16.1  560s
442241 92156 infeasible  134       877.00000  802.00000  8.55%  16.1  565s
444469 92833 infeasible   93       877.00000  802.00000  8.55%  16.2  570s
444570 92841  802.00000  128   32  877.00000  802.00000  8.55%  16.2  575s
444896 92918 infeasible  103       877.00000  802.00000  8.55%  16.2  580s
445944 93056  845.00000  130   29  877.00000  802.00000  8.55%  16.3  585s
448364 94456  802.00000   86   23  877.00000  802.00000  8.55%  16.3  590s
455547 94426 infeasible   90       877.00000  802.00000  8.55%  16.2  595s
457785 95093  802.00000   94   30  877.00000  802.00000  8.55%  16.3  600s
462515 96256 infeasible  116       877.00000  802.00000  8.55%  16.3  605s
467745 96854  802.00000   97   24  877.00000  802.00000  8.55%  16.2  610s
473370 98790  813.00000  140   25  877.00000  802.00000  8.55%  16.3  615s
477953 99681 infeasible  141       877.00000  802.00000  8.55%  16.3  620s
483985 101231  802.00000  138   22  877.00000  802.00000  8.55%  16.2  625s
488551 101778 infeasible  137       877.00000  802.00000  8.55%  16.2  630s
490189 102329  802.00000  123   26  877.00000  802.00000  8.55%  16.3  635s
495057 104410 infeasible  107       877.00000  802.00000  8.55%  16.2  640s
498719 105675 infeasible  145       877.00000  802.00000  8.55%  16.2  645s
503454 106913  802.00000  118   28  877.00000  802.00000  8.55%  16.2  650s
509628 108034 infeasible  106       877.00000  802.00000  8.55%  16.2  655s
513281 109153  874.00000   81   17  877.00000  802.00000  8.55%  16.2  660s
516694 110000  802.00000  102   24  877.00000  802.00000  8.55%  16.2  665s
519450 110244  802.00000   96   28  877.00000  802.00000  8.55%  16.2  670s
522141 110947 infeasible  108       877.00000  802.00000  8.55%  16.2  675s
527703 112773  802.00000  111   30  877.00000  802.00000  8.55%  16.1  680s
532414 113908  802.00000  120   32  877.00000  802.00000  8.55%  16.2  685s
536203 114795 infeasible  124       877.00000  802.00000  8.55%  16.2  690s
537942 115734  802.00000   93   24  877.00000  802.00000  8.55%  16.2  695s
544987 115766 infeasible   96       877.00000  802.00000  8.55%  16.1  700s
545660 115809  802.00000  102   25  877.00000  802.00000  8.55%  16.2  705s
548992 116457  802.00000   85   22  877.00000  802.00000  8.55%  16.2  710s
552692 117540  848.00000  116   23  877.00000  802.00000  8.55%  16.2  717s
559612 117473  802.00000   79   29  877.00000  802.00000  8.55%  16.1  720s
560083 117644  802.00000   79   35  877.00000  802.00000  8.55%  16.1  725s
563477 118358  802.00000  115   31  877.00000  802.00000  8.55%  16.1  731s
563560 118395  802.00000  120   26  877.00000  802.00000  8.55%  16.1  735s
563773 118421  802.00000  122   31  877.00000  802.00000  8.55%  16.2  740s
564499 118664  802.00000   89   28  877.00000  802.00000  8.55%  16.2  745s
567394 119306 infeasible   98       877.00000  802.00000  8.55%  16.2  750s
572981 120558  802.00000  113   26  877.00000  802.00000  8.55%  16.2  755s
577119 121572     cutoff  114       877.00000  802.00000  8.55%  16.1  760s
582010 122018 infeasible  138       877.00000  802.00000  8.55%  16.1  765s
582162 122319  802.00000   58   43  877.00000  802.00000  8.55%  16.1  770s
588586 123053  802.00000   79   30  877.00000  802.00000  8.55%  16.1  775s
594002 124108  802.00000   77   33  877.00000  802.00000  8.55%  16.1  780s
597420 124764  802.00000   87   26  877.00000  802.00000  8.55%  16.1  785s
598844 124865  802.00000   85   25  877.00000  802.00000  8.55%  16.1  790s
599155 125018  802.00000   92   33  877.00000  802.00000  8.55%  16.1  795s
602455 126718  802.00000   82   27  877.00000  802.00000  8.55%  16.2  800s
608127 128274 infeasible  157       877.00000  802.00000  8.55%  16.2  805s
612788 129339 infeasible  199       877.00000  802.00000  8.55%  16.2  811s
613002 129346 infeasible  185       877.00000  802.00000  8.55%  16.2  815s
613011 129338  802.00000  154   28  877.00000  802.00000  8.55%  16.2  820s
613034 129369  802.00995  155   30  877.00000  802.00000  8.55%  16.2  827s
613826 129433  842.00000  165   20  877.00000  802.00000  8.55%  16.2  834s
615039 130428  802.00000  153   34  877.00000  802.00000  8.55%  16.3  840s
621355 130417  814.00000  146   28  877.00000  802.00000  8.55%  16.3  846s
624815 131447  802.00000  178   23  877.00000  802.00000  8.55%  16.3  850s
627513 131568  802.00000  153   30  877.00000  802.00000  8.55%  16.3  856s
631497 131628 infeasible  151       877.00000  802.00000  8.55%  16.4  860s
632196 132172  808.00000  140   24  877.00000  802.00000  8.55%  16.4  866s
637904 132556  808.01896  170   26  877.00000  802.00000  8.55%  16.4  871s
642526 132770 infeasible  204       877.00000  802.00000  8.55%  16.4  876s
642753 133574  802.00000  172   27  877.00000  802.00000  8.55%  16.4  880s
651543 133488  860.93667  178   14  877.00000  802.00000  8.55%  16.4  885s
653944 133571 infeasible  140       877.00000  802.00000  8.55%  16.4  890s
656837 133675 infeasible  142       877.00000  802.00000  8.55%  16.5  895s
658368 134301 infeasible  150       877.00000  802.00000  8.55%  16.5  900s

Cutting planes:
 Gomory: 3
 Implied bound: 13
 Projected implied bound: 2
 Mixing: 1
 Flow cover: 18
 RLT: 1
 Relax-and-lift: 4

Explored 664235 nodes (10932573 simplex iterations) in 900.60 seconds (574.73 work units)
Thread count was 8 (of 8 available processors)

Solution count 10: 877 883 950 ... 2643