All i run on is carpet and i do have the BMI chassis(3mm)on my car,I have the mod done on the top deak and dont really have any tweak problems,I would think with the thinner top deck you would have more tweak issue's,not less.I check tweak after every run,If your racing on as high traction surface you should check tweak after every run,It does not take much time.I check mine even after a clean run,The way i look at it is I allready paid for it so I'm getting my moneys worth..
