When my '69 Barracuda 340 was about 4 or 5 years old, wheel hop started on aggressive acceleration, so I took it to a spring shop, and they installed an additional leaf, 2nd layer, making 7 each side. Problem solved, and as a bonus it raised the rear an inch or two which I thought improved the stance and looks. The springs are still working as intended, no hop.

My recommendation is to add a 2-1/2" wide leaf to each side that is 54-1/2" long with center hole 19-1/2 from the front end and see if that fixes the wheel hop. This could be relatively fast, cheap, and easy. I believe my extra leaves probably came from a junk yard, because they were hand cut to length by torch. Photo shows the extra leaf in 2nd layer.