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The post is unclear. Are you equating "better oiled," with carbon on the piston crown? That's not a valid conclusion. Generally, modded saws need a larger amount of oil in the mix, like 32:1. That is one school of thought anyway. I run 32:1 in all my modded saws. The plug looks happy.

I have yet to pull apart an engine, stock or modified, and find a piston so free of carbon, though I have noted improvement with a larger exhaust port and muffler opening. What type of oil are you using, Al? Were you also using 32:1 after modifying?