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OP, I would run a 275/35 front and 295/35 rear tire on those rims. you may have to roll your rear fenders depending on your ride height and offset of the rims. I run a 295/35 tire on 18x10.5 rims on all four corners of my car without issues (rear fenders are rolled), and I'm lowered 2" on coilovers.
I'm running 18in DD C5s. 9.5 front(255/40) and 10.5 rear(295/35) and I'm lowered 1.5in. Only issue I have is on full lock it rubs a little. Reason why I went with 255s on the fronts.