Hiya,
well we dont have angels, but have had the same problem with our gouramis, when we very first got 2 powder blue ones, our female ended up picking on teh male and he got depressed stopped eating and ended up dieing
we now have a different male gourami in the tank and he picks at her, though not enough for her to become a depressed fish, if anything I think its put her back on track, cos she seemed to be going a little crazy being teh only gourami, youll find that most fish will pick at each other around breeding time too, but for some reason they do get territorial and become aggressive, even if they have never been like that b4, if it gets bad enough you will have to take him out otherwise you risk losing your male.
but definatley just try seperating them for a bit, if you take one out for a bit take out teh female as shes the one thats acting terrortorial and if u put him back in after a while theres no reason why she shudnt be the same.
If you put her back in after a while and the males already in the tank, hopefully she wont feel she has a right to be a mean fish.. but who knows.. us females can be VERY PICKY
hehehe
goodluck anyway, keep us up to date on this one
starry^