Marzocchi MZ Comp... Is that an MCU/oil fork, if my google search is correct. You should either be able to get a lighter weight MCU from Marzochhi or perhaps aftermarket or change the oil to a lighter weight oil (or both, but preferrable one at a time). The MCU might be a good start, but do realize that the cold weather (It should be cold in OK) will tend to freeze MCUs which make them harder than normal so if you're riding now, the stiffness might be due primarily to the weather. But keep that in mind that you can change out the MCU and oil in your fork. I'm even lighter than you at 130lbs and when I had my old Proflex Beast (Girvin Vector fork), I changed the oil to a lighter weight and that helped a bit.

Jay