RE: gas/glow conversion fuel mix question.
You might try putting the magneto ignition back on it, and see how it idles then just in case you have some unrelated problem. All of mine will idle so low you can almost count the prop blades going by. They often won't shut off even with the carb all the way closed, and will just sit there putt putt putting away.... When trying to shut them down with the carb all the way shut, I have often had them backfire and take off idling in the opposite direction!!
AV8TOR