mancini or jeggs leaf spring xhd 340duster

Maybe I did something wrong, Put in an 8 3/4, relocated the springs, new shackles and new shocks. Stance is about right but the ride is horrible. You hit a bump and I mean any bump and it feels like the whole rear of the car comes off the ground. Gonna see if I can make a few adjustments and then I'm gonna start removing leafs.