When you take the pistons out, double check the way the rings were installed. Especially the second ring. I see you are gas ported with vertical holes. This is one of the reasons I personally don't use that style piston. They do tend to allow some oil into the combustion chamber if the second ring is not a secondary scraper style. They also require a very round cylinder as the rings have a difficult time dealing with an out-of round situation. The second ring should have a little step on the OD of the ring facing down to act as a secondary scraper. This should help. You might want to make a call to Total Seal and talk to them. Describe the situation and that you have the engine down for a second time to try and seal it up. See what they say about ring selection and their recommendation.
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