Flooding is the most common problem with inverted engines and each installation will give different results.

I think the main reason for inverting an engine is to maintain a scale profile, no one wants a cylinder head sticking out the top of a cowl or a huge muffler hanging out the bottom.

If your inverted engine setup is prone to flooding, siphoning through the carb on its own, you can do two things.

1. Do not fuel up until your ready to fly.
2. Clamp off the carb feed line with a hemostat until your ready to fly.

As far as idle -bar glow plugs go, I've used all types and can see no difference, just use a good plug like a Enya #3, OS 7, or and number of quality plug, I've found the cheaper the plug the shorter it's life.

My inverted Super Tiger 90 powered World Spitfire has NO bad habits, no fueling problems.

My inverted MDS 148 powered World Funworld siphons, fuel drips out of the carb after fueling so I have to clamp the line.