that doesn't look right... should look like a light brown. my piston that has about 40hrs on it does not even look that way. i think it was still very rich or the rings never really seated correctly and you were burning oil.
i had a 180 main, needle on the 3rd or 4th clip, and a 48 pilot i think. id have to pull it apart to check.
when i went back for the re-tune, we moved the needle clip 2 positions.. so im sure the main has been too rich from the beginning.[/b]