not sure if this is helpful or not, but on my jetski engines i used coatings on the pistons
i do crank the heck out of the compression too
these are two strokes, so what i have heard is its a big benefit for them
i was able to run some hi comp on 110 fuel with no issues when i was told it should be 112+, and that was out in the high dessert heat temps too
however piston technology has also come a long way, and cryo treating wasn't readily available, well not in my build time frame windows
i also just see it as "extra" insurance so to speak
i did debate this with a high end engine builder, and he gave me another angle that he looks at, i dont recall what it was, but something about wanting to retain some of the heat. he's a wealth of engine knowledge so i am sure he had tested reasons, and it might have been for specific builds too
i thought i read, and was probably told from either the coaters/builders/manufacturers that you have take ring gaps into consideration, now again this might have just been 2 stroke related. it was something about heat.
to me, if you are playing in the ragged edge of tuning it probably wouldn't hurt.
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