[Greg58]

This is the kind of thing that kept me from changing my clutch for years, we've heard of this same problem from a lot of people so its not something that the installer is doing wrong its probably that the clutch system it self is the weak point. I changed my disc only last weekend with no problem, I reused the pressure plate and marked its location before removal so I could put it back. One of the earlier posts was to change to a different type pressure plate, I had to do that in the 70's to stop chatter in a GTO. I tried the same things you have, finally went with a much heavier unit for a 426 hemi to fix it.