mate I got a very similar problem, my steering wheel was off centre, so went to DWS in grays where my brother, excellent mechanic he is, did the tracking for me and also had a look at the steering wheel, fiddled with a few things, and said well mate thats the best its going to be, which was actually pretty much spot on, but it has slowly gone back to the way it was so god knows, still not quite as bad as what it was though