had st at the track yesterday till servo died again, i thought it may have been the battery pack but nope, servo's toast. i went back to the stock tires and rims and the push was the same if not less than the other tires i've run, grp cubic and grip and the panther (small pins). i still have the 20+k center and 15+k front with the 3k rear, not sure the push is coming from the tires here, but if it worked for you keep it up. we ran on blue groove with some damp dust yesterday.