The wheels show no problems of vibration, such as being unbalanced. I recently got an alignment, and the tech told me that I need aftermarket spindles so the axles would be straight. The only reason my axle was looked at was because I needed the front lower control arm replaced, it was bent, and the axle was broken. Is it possible the angle that the axle is sitting at, it is being put under to much stress? The high speed stability problem seems as the front end of the car gets realy light and the steering is much more sensitive.