Hallo!

All engines ,foustrokes as well as twostrokes can and will run without glowpower...even under run-in conditions
Have you tried to adjust the highspeed needle so that the engine run whitout glowpower?
Hot!? Every engine should get hot..othervise it will not function!
But when you say hot....what do you mean by that?
Do not use to much nitro! Most engines are not constructed to work well on more than 15% nitro. I recommend 10% for your engine!
20% castor oil is good! But syntetics are better!
We use 15% in Europe!! Motul "Micro" is the name. You could get it in any Bike shop, its a French manufacturer of racing oil for the Motorcycle market. But they also make a very good oil for us "Glow engine users"!
Thats the Motul "Micro" oil!

Regards!
JanK
Sweden