Ride Height
Justin,
Just raise the rear ride height a bit. That will transfer some weight onto the front for steering, and lighten the rear for rotation. If that doesn't work enough, you may have to lose the spool, as they make cars push on tight corners at low speeds. Grandpa posted several pages back how to make a nice tight diff for forward bite, but still uncouples the front wheels enough to turn. Good luck and report back...