Quote:
-CP ring gaps: top ring .26, 2nd ring .28 and oiling rings .15
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Your rings are not butting. My last couple of builds used 24, 26 and we all know I built the living hell out of that engine and the rings showed no signs of butting. Latest build uses 22, 18 with CP rings on 100mm CP Pistons.. I say it's nothing to do with the rings.
Inspect the heads in detail, especially the head that showed the piston with the extra oil on it. Sounds to me like a bad valve seal or bad guide allowing oil to be sucked in. Was their carbon build up on the valves? Another sign of an issue with the valves.
FYI - Break in period IMO is the first 5 miles.