Tuck, make sure your pinion angle is correct. Also, general use blocks are to big for the axle bracket. They need a steel plate on top for the bracket to set on. That was my prob. Just didn't look bad when assembling. The beltech blocks I got are the correct length front to back and support the axle bracket properly. And they have 2dg of correction built in. Something worth trying.
Mike, I'm just going for a comfortable driver, nothing to lay frame with. And I've found that with 35-40psi in the shocks it rides better than stock. REALY a smooth ride. My van is my fun vehicle, it sits about 8" lower. And if I ever get my bug done it's lowered a lot, with a 5.5" narrowed front beam I built.