I don't really expect anyone to change the established abbreviations, but there is another crossdressing forum that requests people do not use the term "GG" because it is also used in reference to a horse. They recommend "RG" for Real Girl.
I'm thinking that RG is not good, because plenty of trans women would identify themselves as a "Real Girl". Instead, I think a better alternative is to drop the "girl" part and use GW = "Genetic Woman". We can't use GF = "Genetic Female", because GF already means Girl Friend.
Likewise, it makes more sense (to me anyhow) to use:
GM = Genetic Male
DRAW = DRessed As Woman
DRAM = DRessed As Man