MGM Programing Questions

With the defaut settings on mgm160 controller with neu 1515/1y 4s maxamps lipo in 3905 maxx with 68/20 gearing it didn't impress me, ... it was decent, I want stampede vxl performance in my 3905 if that makes sense...I have not had a chance to run since changing the freewheel setting to "off" and putting the accelerating setting to .013...its raining and 32 degrees today dang it....hope the freewheel setting will help make it seem alot faster...otherwise should I go 5s or 6s on this setup?