I have cable ones on mine too in the same place these guys are saying. My dealer put mine farther back on the skid but they were rubbing on the track so i changed that.
I think the xm is going to sell its self to the polaris riders. I let a polaris guy ride mine on a hillclimb he was in love. Think hes trading off his 2012 pro now.
tighten your middle shock and if that doesnt do much mess with the strap. On my 163 xm I just tightened the middle shock and it seems fine. These things will be amazing when the breakin mode is over they pull hard.