Rear suspension recommendations?

Hi all-have tried 3 different setups on my '75 Duster rear and am unhappy with all of them. What would you suggest for a setup that gives me good launch control (I have an 8 1/4 rear with 3.55 SG and adjustable pinion snubber), great cornering(I have KYB Gas-a-just shocks, swaybar, and JCWhitney springs), and add 1 inch lift for the 255/60/15 BFG TA's I have on now? I tried air shocks but they added too much lift when I put the pressure in that I needed for control, had traction bars which worked fine but decided I didn't like the look(that's when I made the pinion snubber), and lengthened the shackles an inch for the clearance, putting on Cuda shocks as they're supposedly an inch longer than A-body shocks. I still have a car that wallows in turns and has too soft a ride. Are the springs the culprit, or should I have stayed with A-body shocks even after lengthening the shackles? Anyone who has his A-body set up with the goals I have in mind, could you point me in the right direction? I'm running a 325-hp 318 with 100 shot nitrous, don't really race but do enjoy canyon carving. Thanks in advance.
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