I remember having the same experience with the 22mm setting off road. As for tire sizes, most people say that they rub with 225s, i have 17 x 7.5 rotas on 215s and i have no problem
You'll have no problem w/225's at stock height or an inch or less drop in the rear. I have 17x7.5 Gram Lites w/225/45x17 Toyo T1-S tires w/stock height. I live in Seattle (read: Streets of San Fran) and have had 4 adults and a child in my car and still no rubbing. I plan on going w/Prodrive springs in the near future.
People who experience rubbing w/225s have had their wagon's lowered beyond the point of clearance w/the 225s in the rear(admittedly not a whole lot of room to negotiate with). Just want to set the record straight.