I've been having pretty severe shimmy/vibration with set of 16" chrome factory wheels with 225/60/16 Uniroyal tiger paw tires. Vibration is worst in morning and on hard turns. Mechanic has done alignment and changed bushings. He has also checked rims and tires- all are ok. In frustration, swapped sets between my 750 and my 735; the trouble was transfered to the other car which was previously running smooth. What the h#@? is going on? Mechanic says best bet is to just by a set of oem rims and tires (opinion shared by two shops. Any advice would be appreciated.