Wheel hop in REVERSE?

Ok years ago i did a auto to manual shift in my 65 barracuda. Ever since i have been fighting a severe thud and wheel hop in reverse. Under suggestion i changed leaf springs, no help. I have played with pinion angle. Best i have had tranny down 2.7 degrees down and rear 1 degree down and slip the clutch. Recently i tried still tranny 2.7 down and rear 1.5 up and that made it worse even with slipping clutch. Could the unparalleled angle 2.7 down and 1.5 up be the issue. I have a pair of 4 degree shims. It might make it slightly over on the up side. Any thoughts appreciated. Might try to shim tranny up a degree or so. Thanks