Yeah, we find much the same thing - SoCal has an offroad track in the same bldg. We vacuum (well, Erik usually does it. . .) each week and by the evening the sedans have laid down enough rubber that it gets to be good racing. It really affects us pan car guys - we generally don't even put the cars on the track until around 1:00-2:00 since not enough rubber has been laid down yet.
