74M35A2
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Top ring may have been chrome plated. Second rings are usually just plain iron. Check the new rings you ordered when they arrive, this may be the case there. I think relaxed state does matter partially as it will indicate the ring sealing pressure against the cylinder wall. Again, check the new rings when they arrive. I am really tuning into what looks like carbon around the wrist pin area. That looks like combustion getting past the rings, if the skirts were not Teflon coated like the tops (I'd have to go back and check the pics). Also, what about the white deposit outside of the injection bowl on top of the piston? Is there any polarity to the injectors? I know you have had them out and apart several times, adjusted pop pressure, all that. If the injector hole(s) are somehow now not aimed correctly at the bowl, it could be causing all of this?