Glad to hear your engine is settling down. Enya's can be a bit harder to tune than an OS LA, but they will last longer. That iron pison is a big reason why. Iron pistons break in slower, but last longer than ABC engines.

The idle speed thing sounds normal. There is a limit to how low you can idle an engine, and a new engine won't idle well until it's broken in. The low end mixture also has a tendancy to change as the engine breaks in, so spending too much time on the low end mixture early on is a waste of time, it will need adjusting later anyway.

Anyway, if the engine is settling in, that's great. Probibly just a matter of getting it broken in enough. If it's still giving you trouble, you might try some different fuel or glow plug. Some engines are more picky than others about such things. With an iron piston, fuel with a little caster oil in it might be a good idea. Iron pistons don't react well to lean runs, so the extra protection of the caster isn't a bad idea.