I have the same problem and have done many different things, I just replaced the upper control arm "liquid filled bushings" I noticed that one of the original ones i replaced had leaked, so far it has helped a lot but still did not illiminate it completely. the bushing cost $27.00 ea. but I have noticed that Bavarian Autosport sells a second type of upgraded bushing for $54.00 ea. part # ASCB2 phone # 1-800-535-2002 I wonder if this bushing would eliminate the problem? p.s. I bet that you have aftermarket rims.