Hi guys, sorry to jump in this is my first post so hello.
I have a 335d on a 2010 and I found this thread during a search on the interweb.
I have this same problem on my car, and it's not right.
The car feels like its windy or tram lining even at 80-90 mph.
I'm going to put the run flats back on and get it in for warranty as something must be broke. there is no way a BMW should drive like this, my others haven't.