Where the rubber meets the road.

Need advice. I have a 2010 rock warrior sitting on some nitto ridge grapper 315/70/17. I have rubbing and my front tires have been leaned out at the top. (Previous owner must've really wanted to squeeze those tires under there.) The tires are a MT rated tire so they are a little nobby. I was wondering if I got a AT rated tire(less blocky on the edges) if it would rub less. The truck has the bilstien shocks and they are set at the max lift of 2.5in. I'm ultimately hoping to not go down in tire size to much or get to far away from the awesome nitto ridge grapplers and make my tires stand up straight and not rub. What's the biggest tire I can run with no rubbing? Also will like a 1in wheel spacer help with the rubbing? Or go down in tire width? These are 12.5 wide so maybe a 12 or 11.5 wide? Or do I just need to bite the bullet,spend the money and lift the whole truck up another inch or 2?