Try reducing the infill wall overlap
It is defaulted at 15% so try 5% to -5%
Also if your wall line count is at 2 you might try 3 walls
As well you could try and change your infill pattern, grid is a tricky one to dial in
I use Gyroid infill more often than not but if strength isn’t really required the Lines pattern works well in many cases
To reduce time you could also select infill combination