what causes BAD wheel hop in reverse

Correct me if I am wrong, this car is a 65 cuda, shouldn't the pass side springs be diff from the driver side. When I look a pics of new springs it looks like the stack of springs are shifted more forward on the main leaf on the pass side. Could this have been done to prevent the kind of prob I am having. My current springs are the same on both sides. The previous owner had a 8 3/4 rear from a 71 duster put in it. They may have used the duster springs also-don't know!. If I ride with 2 passengers in the back seat I bottom out on the pinion snubber that is adjusted about 1 1/2 inch below the floor. My shocks are QA1 adjustables so all my bounce is in the springs. Now to me this would indicate weak springs. This week end I will be i Ohio and am going to make a stop at summit. I might consider getting a set of the XHD springs. I know I will have to make a spacer for the driver side to even out the ride height. Something I have noticed, knowone makes traction bars for mopars, just the slide a link. What gives. Keep giving suggestions Thanks