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Mark, I did read that message, a loooong time ago when I first found this thread. If you have the stomach for it, a follow-up message to Alwin or his successor about your more recent purchases could only help. It might not do any real good, but it could not hurt. I note that most mass market magazines writing about the PCCB option on Porsches now note that they are not favored for track use. There is much more awareness of this issue now than there was at the start of this thread and Porsche should hear as much as they can about the issue!
FWIW I am told that the second gen rotors can fit on cars with Gen 1 PCCB. I don't know if they work better because part of the problem was/is a lack of cooling on the 996 series cars. We've already seen a post regarding replacement of Gen 2 PCCB due to cracking. Anybody know what replacement Gen 2 rotors cost?