It looks like you have some dirt or the skirts are scuffing. The tops of the pistons look like they are getting too hot, and burning. Which is very possible a fuel issue. And if the pistons are getting to hot, then maybe you do not have enough ptw clearance.
I will agree to with Drew that the flaking of the coating could cause some of that too. It takes good coating or it is not worth doing. I do not even use the crown coatings at all.
4.035 bore is .024/.025 ring gap on a performance engine.
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