For starters a 9.5 and 10" rim aren't wide enough for that monster 285 AD08. I ran the 285/30 on my E90 with 18x10.5" rims and there was a lot less acceleration grip. Remember that dec/acceleration is improved with taller diameter, cornering improved with width.
I only ran this size because I had the wheels and tires from me Z3 Mcoupe. They were 255/35 F with 285/30 R....this was on 18x9.5 and 10.5 ARC-8's.