Don think back to a bone stock 69 Camaro. Did it ride OK? So what has changed? To me overall suspension design can get into a lot of stuff w/ roll centers, instant centers, etc. But ride is much reduced from overall design. You need 5-6 inches of wheel travel w/o anything hitting anything else, no control arm bushings binding, no geometric binding (an old Fox Mustang rear suspension would not roll if all bushings were replaced w/ spherical bearings), and reasonable shock and spring rates. The OP says his shocks are in the middle of their travel so that is good. I'd next disconnect, or remove if necessary, the coilovers to see if the suspension will move up and down w/o them. Next I think he also said the shocks are on #6 adjustment. Why? I don't know the specifics of those shocks but I have never seen any that #6 is the softest setting. Usually 0 or 1 is softest so that needs to be tried to see how it affects ride. And I may have missed it, but I haven't seen a spring rate # yet so we have no idea what he has. Based on your experience one other possibility is the shocks are completely wrong for the car. An adjustable shock has a range of stiffnesses available. The softest setting on these shocks could possibly be too stiff for this application. I once had the compression damping made softer in a pair of QA1 DA coilovers because it was too stiff for a good ride in a cobra replica. I figured that QA1 probably valved them more for something like a Camaro which would be 6-700# heavier.
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