Lately I have been switching my front tires(foam pre-mounts) from side to side after each qualifing run and main run. Tring to keep them a little closer in size as one side seems to wear down faster,although the coning problem is still there they seem to stay closer in size without having to true them. The rears really dont seem to have this problem as bad maybe just a 1/2mm difference after a few weeks pracitce and racing. Do any of you guys do this or is it just overkill?