Mine wont run at all below 3000 rpm with the glow plug powered?? The idle is so rough at low rpms I had to add some nitro.

Mine motor is a chainsaw motor with higher compression. With that in mind I do think there is some pre ignition at lower rpms but it smooths out at higher rpms.
Mine like to run backwards. I have to flip the prop backwards to get it to start in the right direction.

I guess what I am trying to say is that it seems these conversion have a mind of there own.

If I were to start over I would just try 50/50 gas to methanol at 50 to 1 with castor or klotz oil. If the motor ran rough I would add some nitro in the form of glow fuel.

The best my motor ran was on straight 20% glow fuel but it makes a mess and is very expensive and I had to do carb mods.