I have a 05 MXZ 600HO SDI Adrenaline. I noticed that when I lift the back end up and let go, it'll sag a couple inches all on it's own with no weight on it. It compresses about 1.5 inches with me on it. The ride doesn't seem harsh, I'm just not used to my sled sagging without me sitting on it. Is this normal on the REV? I weigh 160 and I've got the springs on #3 setting.