275 is probably the widest you should mount to a 9.5" wheel. I'm running 275 Conti's on them with no issues, however I may be giving up a little performance. Having the tire stretched on the wheel has been known to provide better traction and tire response.
Maxing out your front stock camber isn't going to get you much especially if you're driving tracks with demanding corners such as carousels. Going with a unidirectional tire such as the RS3 and Z2 would make the most sense because you can swap the tires from side to side.
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1991 E30 M3/Brilliantrot
2017 F80 M3/AW
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