Stock wheels dont need spacers so get rid of that, secondly what size tires are you running? There is a such thing as to much tire which leads to a wobbling feeling. I know for me when I went to wide on the stock rear wheels (285) my car had a horrible shimmy it would do when I'd get on it from a roll. Ive since went back to stock size (255) and havent had issues. Also, all tire brands arent equal. Some are just horrible.