Exactly backwards...But what do I know. Hit the tire to hard it will shake or try to drive over itself as there is not the power available to drive through it. Letting air out allows the tire to cup at the hit and less tire Is in the track, basic physics. Fist move of the tire is DOWN. The more air you have in that tire the more of a contact patch you have on the ground during that first move. On a good track you will wad the tire up and if you have any power at all will shake the tire. TO solve that on a good track take out air and tighten the shocks. On a bad, hot, greasy track you want to run less shock and more air..