Are you saying that the end loop of the string (where it terminates on the cam) is rubbing the inside of the limb?

If so you have issues. I had this problem on my RazorX Tru-Arc with WC strings because the string end loops are wide. But the Hoyts have much more space between limb and cam.

I would take the bow to a qualified Hoyt dealer. You may have a twisted limb, missing/incorrect spacer, or even a twisted riser.

I have had WC on several C.5 bows with no issues of that sort.