I posted with the same problem you have. My issue ( at least the main one) was the rear suspension cross-member (my car was previously rear ended). If you look at all pivot points and everything looks fine, double check the toe adjustment bolts. They tend to rust up and seize depending where you live. I've seen this issue with many buddies' cars up in Connecticut. Having one seized pivot point fighting the rest of the suspension's movement can make the car feel unstable.