Great to hear about the ball diff, but with brushless torque there is very little chance of survival for that diff without some ofna diff lock lube, scuffed balls, and sanded diff rings... Diff bolt expansion due to heat will loosen diff action, even with all of the above, so tightening to the moon will be required...
Another way to get around this diffing out issue is to use very stiff rear springs in order to always pin the front tires to the track...