Kevin...
You say that both the 8.5s and the 9s will clear the front brembos, but have you tried to fit the 9s in the rear? I have read your posts and am aware of the various changes you had to make to get the 8.5s to fit with the 255s without rubbing yet you have never mentioned from what I have been able to find in your posts if you attempted to run the 9s in the rear...reason I ask is because I want to run 9s all round...
areg