I don't have any problems with tire wear, when running lower tire pressures. Most tire shops that I've been to, when they rotate, the tires just go to the front and to the back, they stay on the same side of the vehicle. When I rotate my tires, the left rear goes to the left front, left front to right rear, right rear to right front and the right front to the left rear. This way, every fourth rotation, the tires end up right back where they started. If any one location is causing tire wear, all four tires will get that wear and they have the other 3 locations, to help get rid of the wear. They are rotated every oil change (5,000 miles).
Rodney