MIP problem - Bounds improves slowly

Hi all, 

I am running a MIP problem. My model is a bit complex, but the data is not very large. I have done a lot of parameter optimization settings, but it didn't help much. I would appreciate it if you can give me some suggestions. 

Thanks a lot!

Attached is the MIP log. As you see, bounds move very slowly. 

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Set parameter NonConvex to value 2
Set parameter MIPFocus to value 2
Set parameter NoRelHeurTime to value 100
Warning: parameter changes on this environment will not affect existing models.
Set parameter Heuristics to value 1
Set parameter TimeLimit to value 600
Set parameter Method to value 1
Set parameter ScaleFlag to value 2
Warning: linear constraint 17 and linear constraint 18 have the same name "cos_2"
Warning: quadratic constraint 10115 and quadratic constraint 10116 have the same name "cos_15"
Gurobi Optimizer version 10.0.1 build v10.0.1rc0 (win64)

CPU model: 12th Gen Intel(R) Core(TM) i5-12400, instruction set [SSE2|AVX|AVX2]
Thread count: 6 physical cores, 12 logical processors, using up to 12 threads

Optimize a model with 445 rows, 13600 columns and 44971 nonzeros
Model fingerprint: 0xb33bfd51
Model has 10430 quadratic constraints
Variable types: 4641 continuous, 8959 integer (2023 binary)
Coefficient statistics:
  Matrix range     [2e-02, 3e+04]
  QMatrix range    [1e+00, 3e+03]
  QLMatrix range   [1e+00, 2e+04]
  Objective range  [1e+00, 1e+01]
  Bounds range     [1e+00, 3e+04]
  RHS range        [1e+00, 1e+00]
Presolve added 173 rows and 0 columns
Presolve removed 0 rows and 1953 columns
Presolve time: 0.13s
Presolved: 45166 rows, 23519 columns, 155212 nonzeros
Presolved model has 105 bilinear constraint(s)
Variable types: 9000 continuous, 14519 integer (1792 binary)

......

Root simplex log...

Iteration    Objective       Primal Inf.    Dual Inf.      Time
    4738    6.7387545e+01   0.000000e+00   0.000000e+00    106s
    4738    6.7387545e+01   0.000000e+00   0.000000e+00    106s

Root relaxation: objective 6.738755e+01, 4738 iterations, 0.25 seconds (0.31 work units)

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

     0     0   67.38755    0  396   81.66500   67.38755  17.5%     -  108s
     0     0   67.38755    0  386   81.66500   67.38755  17.5%     -  108s
     0     0   67.38755    0  746   81.66500   67.38755  17.5%     -  111s
     0     0   67.38755    0  745   81.66500   67.38755  17.5%     -  111s
     0     0   67.38755    0  443   81.66500   67.38755  17.5%     -  115s
     0     0   67.38755    0  538   81.66500   67.38755  17.5%     -  118s
     0     0   67.77776    0  611   81.66500   67.77776  17.0%     -  122s
     0     0   67.94128    0  691   81.66500   67.94128  16.8%     -  122s
     0     0   69.26473    0  479   81.66500   69.26473  15.2%     -  133s
     0     0   69.49899    0  528   81.66500   69.49899  14.9%     -  137s
     0     0   69.55837    0  694   81.66500   69.55837  14.8%     -  138s
     0     0   69.71186    0  949   81.66500   69.71186  14.6%     -  147s
     0     0   69.78586    0 1096   81.66500   69.78586  14.5%     -  149s
     0     0   69.86169    0  897   81.66500   69.86169  14.5%     -  154s
     0     0   69.86169    0  830   81.66500   69.86169  14.5%     -  155s
     0     0   69.86169    0  937   81.66500   69.86169  14.5%     -  166s
     0     0   69.86169    0 1116   81.66500   69.86169  14.5%     -  173s
     0     0   69.99550    0 1250   81.66500   69.99550  14.3%     -  179s
     0     0   69.99777    0 1107   81.66500   69.99777  14.3%     -  182s
     0     0   69.99777    0 1415   81.66500   69.99777  14.3%     -  187s
     0     0   69.99777    0 1466   81.66500   69.99777  14.3%     -  188s
     0     0   70.01078    0 1327   81.66500   70.01078  14.3%     -  193s
     0     0   70.01078    0 1638   81.66500   70.01078  14.3%     -  195s
     0     0   70.03182    0 1400   81.66500   70.03182  14.2%     -  203s
     0     0   70.06715    0 1617   81.66500   70.06715  14.2%     -  207s
     0     0   70.07655    0 1447   81.66500   70.07655  14.2%     -  214s
     0     0   70.07655    0 1763   81.66500   70.07655  14.2%     -  215s
     0     0   70.09451    0 1532   81.66500   70.09451  14.2%     -  221s
     0     0   70.10168    0 1766   81.66500   70.10168  14.2%     -  224s
     0     0   70.11258    0 1556   81.66500   70.11258  14.1%     -  229s
     0     0   70.13884    0 1786   81.66500   70.13884  14.1%     -  231s
     0     0   70.14686    0 1886   81.66500   70.14686  14.1%     -  238s
     0     0   70.14686    0 2005   81.66500   70.14686  14.1%     -  239s
     0     0   70.14686    0 1975   81.66500   70.14686  14.1%     -  245s
     0     0   70.16415    0 2049   81.66500   70.16415  14.1%     -  249s
     0     0   70.17141    0 1754   81.66500   70.17141  14.1%     -  254s
     0     0   70.17141    0 1803   81.66500   70.17141  14.1%     -  256s
     0     0   70.17141    0 1833   81.66500   70.17141  14.1%     -  262s
     0     0   70.17141    0 1723   81.66500   70.17141  14.1%     -  264s
     0     0   70.17239    0 1740   81.66500   70.17239  14.1%     -  269s
     0     0   70.18786    0 1989   81.66500   70.18786  14.1%     -  272s
     0     0   70.19991    0 1832   81.66500   70.19991  14.0%     -  278s
     0     0   70.20044    0 1930   81.66500   70.20044  14.0%     -  280s
     0     0   70.21264    0 1729   81.66500   70.21264  14.0%     -  284s
     0     0   70.21264    0 1951   81.66500   70.21264  14.0%     -  285s
     0     0   70.21264    0 1734   81.66500   70.21264  14.0%     -  292s
     0     0   70.21264    0 1842   81.66500   70.21264  14.0%     -  294s
     0     0   70.21341    0 1789   81.66500   70.21341  14.0%     -  300s
     0     0   70.21341    0 1737   81.66500   70.21341  14.0%     -  303s
     0     0   70.22565    0 1759   81.66500   70.22565  14.0%     -  311s
     0     0   70.22565    0 1852   81.66500   70.22565  14.0%     -  313s
     0     0   70.22565    0 1695   81.66500   70.22565  14.0%     -  319s
     0     0   70.22604    0 1686   81.66500   70.22604  14.0%     -  320s