Yes, SE, not LX. I fail to keep up with the model designations.
Mmmm. My 13 Fusion also had some tire issues. Not as bad as yours, but they did seem to go bad on the rear. Real bad cupping. The vehicle had been rear-ended about a year after I got it (rather severely - $9,XXX repair) by a drunk driver in FL. I always just assumed maybe the repair was not quite right. I think I put 2 full sets on it, plus another 2 tires right before I got the Flex. It had maybe 90k on it by then.
I was talking to a worker from our local Goodyear, tire center and he said the problem is that the 2013 needs spacers placed in the rear end suspension. The rear wheels tend to flex and slide side to side. The spacer stiffens up the suspension and fixes the problem. He claimed that ford knows about the problem but refuses to fix it.