DaveC, without actually seeing it, its hard to tell. My shop did tell me they had to replace cams on a 2k6 Tribute because the bearings were not pressed into the cams correctly. Is it wearing on one side of the cam or both? If its one side, that might make sense. Meaning the cam is "shifted" to that side of the limb split. That is actually what I was thinking was wrong with mine.

Just a thought.