The problem with your 255/285 is that the rears will wear quicker than the fronts. Go back to Willtheyfit and see what that does to your 1.1% if you reduce the diameter of the rears, but leave the front......it gets worse, not better.
I have non runflat 245/285 on mine (Michelin Pilot AS3+). I believe it is .07% if memory serves me correctly. Rides great, looks even better, no issues what so ever.
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