The gain just isnt worth the time. I finish mine with 320grit emery cloth on a slotted mandrel.
A few years ago i watched a deal on acceleration enrichment theory (automotive) which talked about cylinder wall and port wall wetting. One thing that was mentioned was port surface texture.
The texture is there to keep the fuel in suspension NOT to atomize it as is so commonly repeated on this forum. If the shit isnt atomized when it comes out of the carb you have other problems.