I have a few tanks to play around with, so what I did was to purchase an additional male and female dwarf gourami.
They're semi-aggressive, especially to each other, so now, one female is living in all her lonesome in one of the tanks (she's the 'picked on' of the original two), and two females and the male in a seperate non-community tank of their own.
I'm going to let the male decide who he like's best out of the two, and then re-locate the unwanted female to her own tank.
I've forgotten our previous conversations, do you happen to have any spare tanks? It might be better to seperate the pair.