What about a dual rate spring? You'd give up some performance, but perhaps it would soften up the ride under normal conditions.
I had a G Bar in my Camaro which is basically the same thing I believe. I went to a dual adjustable shock and I personally think compression adjustment benefited the ride. There is also the option to build custom axle brackets to allow a longer shock and spring. I lowered my shock mount about .5" to get my shock in mid stroke on my G Bar. I found that I was bottoming out my shock under heavy load prior to the modification. I ended up being pretty satisfied with the G Bar after modifying the shock mount and going to dual adjustable shocks. In stock form, it's not ideal for a decent ride height. I mocked up my rear end without springs at my desired ride height and had the brackets made. It's a pretty simple job. I don't know if it will fix your issue, but I don't recall my car riding that bad.
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Todd
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