I was thinking earlier that maybe feet width(as I think someone mentioned above)is what would make a difference-wider less quads,closer more quads...so I tryed a wide foot placement and close,and everything felt stressed the same,but my quads seemed stressed a bit more once I got close to parallel with a closer stance.Maybe it has something to do with form???I dunno..whichever way Im going to stick with what works for me,which would mean sticking with what spatts has been saying