I got new Sparco Assetto Gara 16x7 wheels and General G-Max AS-03 tires (205/45-16) about 2,000 miles ago and I have had them balanced 3 times over the past month or so and road force balanced yesterday and the shake doesn't change at all, it still shakes over 60 (the shake is worse at some speeds than others). The car was also aligned a couple thousand miles ago. I don't know what I should check next, and I don't know if I should take it to the dealer because of my Eibach springs, any suggestions/ideas?