ah, your original post said scraping on curbs when parking. The only way i found to stop that was to park backwards (had to do the same on my E90 as well).
As for scrapping on speed bumps that is a little more difficult (i am sure many of us have the same issue). However all i can say is take it slow and if you can move to the middle of the road and go over the highest point of both ramps (one wheel on each), so the underside is at the lowest point of the bump. If you cant do that then just go over the bump with one wheel, really slowly.