Sorry I missed your message on here. I had to ditch the Southside lift bars on my car. They made the rear end too stiff. I ran a set of old chrome slapper bars with rear drag shocks. I already had front drag shocks on the car. I later installed Shelby under ride bars. Whether I'm running drag shocks or slicks the bounce has never come back.
I am having what sounds like the same bouncing problem with my Fairlane that you may have had. I recently put a 5 spd in with drag radials and QA1 double adjustables. It hooks but seems to bounce after the tires are hit on the launch. I am running South Side lift bars with factory leafs. What did you find worked for you and are you running drag radials or slicks?