Fpcalc.exe from AcoustID is also used by MusicBrainz-Picard as an optional file identifier. I have never had a problem with using it within MusicBee or M-P as far as misidentifying a song except for occasional ambiguity when dealing with promo versions, etc. Can you provide a couple of examples of songs that are misidentified, by uploading them somewhere so we can try it with the same raw data? Be sure you are using the latest versions of both MusicBee and fpcalc.exe (see preceding posts on this thread).