Do you have your leaf spring clamps on the wrong way? I'm putting mine back together and noticed yours are on different then mine. I doubt it affects the function of the spring any.

This pic shows the clamps on Dave Waldens Challenger. The rubber insulator is on the top of the spring...not the bottom.
https://board.moparts.org/ubbthreads/upload2/4502617-Dsc05279-1.jpg