IIRC, Big Jim runs 225/50R16 KDWS on his E0 without any rubbing. Problem is, rubbing is hit or miss from car to car and tire to tire in the 225 width. 215 width is so odd that there are only a few hi po tires out there.
I stick with the 205/55 on mine (and I've still rubbed a hole in my driver's rear fender liner). I run 205/60R15 Blizzaks in the winter and I absolutely hate using a higher profile tire. Well, except when it snows. I don't see any reason for going to a higher profile than 55 on a 16" rim because all that's going to do is wreck the cornering ability of the car.