I haven't quite figured out the labels yet either. Some of the more general terms work (well, "nonbinary" anyway) but few are dead on.
I like "liminal" best, but it isn't used much. (And I'll note that I'm listening to Spotify and the song that's on right now is called "Places In Between." Heh.) But I do have a sense of the binary genders being these anchor points -- like statistical distribution curves maybe -- and I have a rope bridge between them or something like that.
"Androgyne" isn't bad, though of course people usually think of it in terms of appearance and physical traits.
"Gender fluid" I've pretty much accepted, though I haven't really yet figured out how much actual flow is going on. If anything shifts it's less my sense of gender identity and more my comfort level with how I'm expressing it. So I don't think it's a perfect term for me. Going back to that rope bridge, it's maybe swaying a little with the breeze and bouncing a bit as I walk across it... no, that metaphor doesn't really work.
But anyway, it was this term that helped me take a step off the "what if I'm an MtF who's too chicken to transition" trail that wasn't going anywhere, so it was helpful for that at least.
"Epicene" is kinda cool because you can't spell it without "epic." But it sounds like it describes dinosaurs rather than genders
It's also not quite accurate, because my internal sense of self says I'm neither an effeminate male nor a masculine female, which that term would mean.
"Genderqueer" I don't like, partly because I still think of "queer" as an insult for gay people, because I think it does confuse people not in the know (and isn't there already enough trouble with people confusing sex, gender ID, and sexuality?) and partly because some people associate it with making a sociopolitical statement.