Wheelhop is the bane of the GTO too. So far the one thing that seems to help the most is having one axle shaft a larger diameter than the other. It supposedly cancels out the harmonics that cause the wheelhop.

Other things that have been tried with some success are air bags and/or stiffer springs.

I am lucky. So far my Goat shows no signs of wheelhop.

IRS in a car that will be used for drag racing sucks for sure.

G Force Engineering does IRS parts for the GM cars. Maybe they will get into the Challengers too.