Could it be, that since the Blue Funk ran well on regular fuel and the difficulty starting was the only issue, the higher octane fuel is merely a shot in the arm; a kind of boost, to get it going?
You can advance the timing a few degrees if you run premium all the time and get the burning process started a little sooner.
Okay- What IF the timing had already been too far advanced- would THAT have caused the difficulty starting and the subsequent easy starting on Premium gasoline?
The difference is just phenomenal! I mean, the Blue Funk starts first time every time!