I had the chucking issue on the rear of my Stinger. Seems common on lowering springs. I asked a shop to align to factory settings, which got rid of like 80% of the issue. I also felt that maybe, just maybe, I had a bad shock. But these things are $$$ so I wanted to try other routes first. When I read other people experiencing the issue, I decided to relax.
I got the alignment dang as close to factory as she would get, and then drove 2500 miles. I only noticed the rear end "shimmy" like twice on the entire trip. Not bad!
I did chuck ATQ bolts at the damn car trying to firm it up. While they didn't resolve the problem, it did make it a whole lot better.
Having one corner .58" taller than the others would bug the shit out of me. Definitely vested to see how the strut replacement goes!