Bill, I was having the same problem with my Eibach's. I just swapped out for H&R's yesterday and all is well again. My coils were just as you described and a BMWCCA Technical advisor verified that they were indeed shot. The fronts appear to be fine. The Eibachs had about 10-12,000 miles on them when it first started to be a problem. Eibach's have a lifetime warranty but I'm not getting my hopes up. You have to send them the springs and they 'evaluate' them and then may or may not send you some new ones. Mine got so bad I couldn't put more than a half tank of gas in the car and it still sat 3/4 of an inch lower in back.