Another thought.
My experience with anything with adjustable rear steer, and I've seen it someplace here on the forum as well, you have to make sure that there is zero flex at all connections in the rear. If there is any, and I mean any flex, everytime you transition from pulling to coasting, you will get rear steer which feels really wierd until your brain finally gets up to speed. I believe there were some guys that were running into this with worn out rear LCA bushings on Goblins.
GMC Denali were available with rear steer for a few years. A real hand full to drive when they start wearing out.
Same with a Grove At 750
Can give you a real "poo your britches" kinda feel at higher speeds.