WOW, sorry Mav, please don't be offended, but don't ever use smoke output as a gauge to measure engine tune. You are right different fuels smoke output varies greatly and thats why I wouldnt use it as a gauge, in my opinion (not that anyone listens
) tuning should be based on temperature, performance and sound, and when you reach the peak turn it back an 1/8. Then you just go to remember to adjust forward or back on the HSN for track type and weather.
Its also good practice to re-tune regularaly as the engine wears. Usually if you forget the engine will start to remind you by not performing as expected or stalling etc. When I re-tune, I go back to factory settings and spend a few tanks re-tuning on a flat open surface as if it was a new engine.