If your clutch is slipping most likely repair is a new clutch. Hydraulic clutches are self adjusting. I'm having troubles shifting right now (clutch not disengaging) so i'm going to replace both master and slave cylinder and hope that it fixes it. I kind of doubt that adjusting freeplay or replacing master/slave cylinders would help in your case. If you can't get your clutch replaced i wouldn't even chance going wheeling. Also from what i hear the centerforce clutches dont' wear very well. The extra holding force of the centerforce clutches isn't really necessary on our rigs IMO. Another drawback of high performance clutches is that once they engage, they engage. sometimes you need to slip the clutch when wheeling, good luck if you have one that grips twice as much as a stocker.