Join Date: Jul 2011
Location: Southern New Hampshire
Inside cupping of rear tires on FWD cars is extremely common. A simple fact of life. You're only method of attempting to avoid this is to rotate early and rotate often. FWIW, I've never noticed any difference between rotating front to back (same side) and rotating in an "X" pattern when it comes to cupping or tire life.
2006 Acura TL 6-Speed Manual
2016 Mazda3 s GT 5-Door 6-Speed Manual