it is what it is
There is definitely a negative connotation to the term "unicorn hunter", but I believe it stems from people's experiences with M/F couples looking for a bi woman to form a triad. These explicit expectations have shown to be unrealistic in practice; numerous issues have been laid out in other posts (what if she bonds more quickly to one of you, what if no romantic bond happens with one of you, etc, etc). I am not saying that an equilateral triad with two women and one man is not possible; I certainly believe all relationship models are possible. However, the sheer number of M/F couples seeking this idealistic model greatly outweigh the number of successful triads I have seen.
Have you tried dating separately?