Would have thought that much bigger would rub in all the most annoying places
No, there's plenty of room.
Here is a picture of my Focus CC3 at Ford Fair 2008
The wheels are 19x9 with 255-30-19's on the front and 265-30-19's on the rear. It was also lowered just over an inch using Eibach springs. It did not rub on full lock, though it was close....but in my eyes close doesnt matter