I noticed in 2 of your replies you mentioned that you have the rear of the springs clamped, this might be alot of your problem, The trick is to let them "fan" out back there, try un-clamping them & see how it reacts.
i was actually just going to do that tommoro! lol i was sitting looking at the springs and in all honesty the one clamp that i still have on the rear segment doesnt need to be there if i have 4 up front...i just kinda thought it would be better for street driving, but all its for is to keep the leafs in place in their stacked position, which i shouldnt have a problem with...the clamp is comin off when i hit the garage!