Jason,
From what you have described it sounds like the offset is incorrect for your application. I'm not sure of the minute, exact suspension differences between a 300E and 400E (help Benzmac) You definitly dont' want to mess with the brakes you have. With the much heavier V8 up front you need the extra stopping power. (see 400E review on this site) I know that when I ran 225/50/16 Firestone SZ50's on Borbet type T 16x7.5 or 8.0 rims.(I forget offhand) front AND rear on my 93 400E it fit fine. No sticking out and no rubbing even at steering lock with the 225's up front. I ordered the wheels and tires together from Tirerack specifically for my application. Their in-house experts took care of the offset question. If you can find out what offset you have on the AMG's try calling tirerack and talking to one of their reps. Failing that, I might be selling my Borbet's separately if your interested in a wheel that I know would fit. (the 400E is being sold to make room for incoming 500E)

Hope this helps....Lee