Most flat tappet cam failures fall in to four categories. 1. dirt. 2. improper break-in procedure. 3. wrong and/or inadequate lube. 4. parts mismatch. In your case I believe it is #4 and possibly #3. It is not too often a manufacturer problem when you really start to look in to what caused the failure. In the long term, going to a roller won't fix any of those problems. BTW, #1 leads the pack by a 1/4 mile!