I am going through the whole wheel, tire, backspacing issue myself. Wonder why the B&B engineers didn't just always put in the narrower rear end!!
I have Welds with big old fat Goodyear billboards on them, thought I'd go with big time backspacing from Team III. The owner there gave me valid advice. Don't settle for little to no dish on a kick ass Cobra. Get a narrower rear end and get what you really want.