..I'll get this back on topic! I haven't seen any updates, anything new?
I would like to add that your drive shaft u-joint could be bad.. did you look over it? A bad u-joint will cause these issues.. I have the same issue, but haven't replaced anything yet. I think I may just replace the entire drive shaft right away to avoid false diagnosis. My guibo looks good, I'll drop the exhaust and look at the u-joint and CSB. I'll keep updated, but I would recommend testing your u-joints by lifting your car, putting it in neutral and trying to twist your drive shaft. If it has ANY play in the u-joint, that is supposed to indicate failure.
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Koni STR.T, poly RTABs, headers, SSK.
Three Pedals, ZSP.