Tire wear, what's causing this! ? ?

^^^ AJ, you wrote up very succinctly what I was thinking last night: what is the use for this car? Street? Strip? These rear springs are really only best for strip use or for culturing a drag race look, IMO. The alignment will change with them in or out. If kept for handling use, I would de-arch them as suggested, but you might be better off selling them and getting others.

And to the OP: Do you know what diameter of front torsion bars you have? Sorry if I missed it in the earlier posts.) If not, then measure it soon and let everyone know. You need to measure them with a caliper, as the size increments are very, very small. The T-bar diameter that is best depends on the desired use, just like the rear springs.