You may want to look at UCA and LCA replacement, and I would use a good quality aftermarket product like CHE. If you change the UCA get the bracket as well it is much better than the stock tin bracket. CHE offers a variety of ends for their products so you can set it up to your liking. Also they have an Anti Squat bracket that may be worth looking at.

A friend of mine has a GT500, and it has crazy wheelhop...I don't think those control arms are the answer.