What we've (roughly) decided on:

High Elves: smug, amoral assholes. Fair Folk to some degree or other.

Dark Elves: good, at least comparatively, and carnivorous.

The other stuff's just proposed and it's confusing to conflate the two things. I mean, I'd personally still expect the high elves to be in forests and wild places, due to the whole 'fair folk' aspect of it. That, and hating dwarves in particular? Stick the dark elves underground, gives 'em a reason for the diet AND a reason to not get on with dwarves.