I think a 285 would or 295 might fit the rear....

After running 4 or 5 sets of 275/30 and 35's have noticed actual tire sizes vary by several MM. But generally haven't had any problems (once the hub carrier nub was removed) with clearance if the off set is appropriate. Solved with a quiver of wheel spacers....

I have the same size and offset as you Dave. Except on the rear which is 31mm.