Alpina, have you found a good solution with your suspension experiments that help (noticeably I might add) with tramlining? Or where you live the roads are so good you never really have a problem with tramlining?
I think the suspension is one of the weaker points of the E9x - not necessarily cost wise as parts are cheap, but the way they're put together to give a universally good driving experience. On smooth roads the 3 series is as stables as a bigger 5 series, but go on poorer roads and car fidgets, skips and moves about way too much. Would you agree?