Something that's slightly stretched will be the only way you can flush out those wheels w/o hitting the fenders.
For a 9.5, something like a 235/40 would be perfect. Friend of mine 235/40/18s on his 18x9.5 Work Meister S1s and they look sick.
Here's his car:
And here's what the 235/40/18 looked like on his 18x9.5: