In that case i would hazard a guess that you're doing everything as right as can be expected, but just haven't come across anyone who is interested in what you have to offer.
Another thing is, are you looking for like, a total lesbian to be polyfidelitous with you two? You might consider expanding your criteria to bisexual women ( there are women who id as pan or bi but prefer women to men, or don't have to get involved with men just because they could be), or women who are or want to see other people. People might not be "turned off" or "scared away" by your profile, they might just think "well, it says what they're looking for, another lesbian, and that's not what i am." or something along those lines.