Cool that you guys are doing this, but its always in the back of my mind that the wheels slipping are ensuring the 'break' point during heavy acceleration is between the tire and the road. At some point, if you can fully 'lock' it against the road with enough grip, the break point may transfer up the drive train to some other component that cannot take the stress.
If you find that component or new break point, let the rest of us know so we can live vicariously.