I've owned a fatfish and a quickfish 3, bought both new, and while I didn't take measurements or anything, it did seem like the fabric stretched a bit from being set up, after several hours. I could tell when popping it up, it got easier and didn't seem as tight when opening a door zipper. On both, the fiberglass rods were always under tension, enough that they would be in a very slightly "S" shape when set up, that never went away.
I wouldn't recommend it without talking to Eskimo first, but I have heard of people who needed to take out their fiberglass rods and trim them down a little shorter. I don't think there is any adjustments that can be made unless the XDs are different than what I have/had.