NV4500 in my C2500

[Bigringgear]

 

I changed the clutch in my "98 C2500 about 2 years ago because the pilot bearing was squealing. That clutch did ok for a little while but started chattering and the engagment point on the pedal kept getting higher. I suspected a bad resurface job on the fly wheel. I replaced that clutch with a Centerforce stage 2 and put in a new fly wheel. I was right about the bad resurface job. Now about 6 weeks later the engagment point is rising again and feels like it could slip under load. Any thoughts? Centerforce didn't have a clue. Thanks!