Another rebuild...

While I had the head off I got convinced to check out the pistons too.  The bores were polished more than I expected, but apparently this is common for wiseco big bore kits.  The pistons themselves were virtually unmarked and all the rings were still lined up ok/unbroken.  So I'm going to rebuild it again and hope it was just the valve seals, if there is an issue with the rings, i can't see it.