OK, big update. I spent a truly embarrassing amount of money bringing the car to a European car specialist near me. All four shocks and springs were replaced. The shocks are all Bilstein. And a 4 wheel alignment (again). He spent extra time trying to fix the unevenness (lower on the rear right), using factory specified shims. The car is obviously the right height in the rear now, but the gap between the top of the rear tire and the highest point of the wheel well is still 3/4 smaller on the right! And a little lean is noticeable standing behind the car. Ugh! I'll call him later, but what the hell?