[Sport69]

Here's my conundrum. I have a 69 coupe with multi-leaf springs (5) and KYB gas-adjust shocks on the rear. The rear end is a GM 10-bolt posi with a 8.5 diff. I'm also running 15" wheels with 245/60-15 tires. My car handles great, corners like it's on rails, but she rides like a buckboard! When I put the new shocks on at the end of my restoration I had to use 2" shock extenders and I believe when I hit a good bump that they're maxing out the shocks extension. I like the stance of the car, but I would like to soften the ride, any suggestions?
I did look through past postings, but didn't come up with any clear answers. I'm willing to change leaf springs if need be (my current ones are heavy duty-660 capacity-125 rate-5 leaves), go to longer shocks, or both, but I absolutely don't want to lose the stance. The car was originally a mono-leaf 350 and was changed to a multi-leaf 400 (yes I changed the spring shackles, and it has new bushings everywhere).