A low speed needle setting that is too lean will also cause the idle symptoms you describe in any 2 stroke engine, be it glow or gas. In this case, richen the low speed needle in 1/16th turn steps until you get a stable idle that doesn't change. It won't take much, as the low speed needle is sensitive to change. You probably will have to use your transmitter trim to open the low throttle a bit, but your engine will not only idle better, it will run cooler at part throttle settings.

Regarding kick back, it definitely could be a faulty ignition, but I've owned the BME 102, the 105, and now have a pair of the 110 Beemers, and the only time they have ever kicked was when I tried to start them and they were flooded (any engine will kick back in that case). You probably already know this, but that's the reason my starting procedure is to close the choke and turn the ignition ON, then flip the prop about 4 times until it "pops" or tries to start. It now has just enough gas in the cylinder to run so I open the choke and within 3 flips, the engine is running. Many guys choke their engine with the ignition off. That may allow too much fuel into the cylinder, flooding the engine and inviting kickback. My way lets the engine tell me when it has just enough fuel to start.