I am having trouble with rubber build up on the inside of my tire rims at HPDE events which may be causing the high speed vibration I feel at speed. I'm running a factory driveshaft, high quality Apex EC-7 wheels and Firestone 500 tires. The were balanced at installation and I taped weights in place. Now the total weight of the rubber may be small but its location on the inside of the rim barrel at high speed could be significant. Am I barking up the wrong tree here and should I be looking elsewhere for the problem?