What's the best square setup with a larger sidewall than OEM on a non-fpsort AWD is300 with stock suspension?

I played with some tire size calculators and got 255/40/18 as the best square setup hypothetically.
This gives a 0.5inch sidewall over stock and doesn't throw off the speedometer as much as other setups with bigger sidewalls.

I'll probably have to get new wheels: 8x8.5 all around.
Will the wider wheel look weird on the front? I'm hoping not to change the offset or use spacers if I can avoid it to make it easier to rotate the tires.