You dont wanna just "spray to see what itll do".... The point of bracket racing is to run consistent times.... Either spray on none, or spray on all.... If you spray on just one, youll have one run better then all the rest, and itll mess your consistency all up, and put you lower in your bracket.... The more consistent, the better... I usually dont touch anything but maybe the tire pressure and/or 2 step if times start to get slower......