How to correctly clamp leaf springs to hookup!

Is it wheel hop or spring wrap?

I've had a problem with what seemed to be clutch chatter for the life of the car no matter what I did with clutch parts, motor mounts, fly wheel, bell housing alinment, trans mount or SS springs. I now believe it to be the springs wrapping up and snapping back. Only did it when letting out the clutch and increasing power. Balls out no hop or easy low power no chatter.

One shop years ago when checking it out was watching someone let the clutch out in the parking lot and during a bad chatter the rear wheels were actually bouncing up and down. Tried taction bars, as an experiment, and they seemed to control it. I dismissed it at the time as treating the symptom not the cause. Now believe I just need to have the snubber properly set to stop the rotation of the differential. When I reinstall the rear end I'm going to check out this theory. May also need to try clamping front part of springs.