It does not help but see this - https://www.soundtouch.com/CommunityDetail?_escaped_fragment_/feedtype=SINGLE_QU ESTION_DETAIL&dc=SoundTouch&criteria=ALLQUESTIONS&id=90633000000Gty6AAC
It does suggest that if the sending device is using AVRCP 1.3 or higher then the track names should show and therefore if OS X is using 1.4 in theory the names should show. It might be worth adding a reply to that thread so Bose see it is a wider spread issue.
On a related topic although it does not sound exactly like your issue, iTunes does not automatically fill in the Album Artist tag, this can be one explanation in some cases for tracks showing the artist as 'Unknown'. It might be worth as a test ensuring at least some tracks do have this filled in. This was found here - https://www.soundtouch.com/CommunityDetail?id=906330000008YlMAAU
When iTunes rips an album it typically does not populate the "Album Artist" tag on the music files unless it is different than the main "Artist" tag on the track.
When using the Bose SoundTouch Server with iTunes, the iTunes interface automatically accounts for the above quirk, and substitutes the "Artists" value for "Album Artist" whenever "Album Artist" is blank. However, when using the SoundTouch Server with Windows Media Player, WMP does not perform this substitution, and consequently virtually every track ripped via iTunes shows up under "Unknown Artist" when browsing the media library through SoundTouch. This makes it a real pain to navigate a large music library.
This is a bug in SoundTouch Server. Pretty much every other music browsing software I've ever used is smart enough to account for the "Album Artist" tag being blank by substituting the "Artist" tag. SoundTouch should be able to do the same without needing iTunes or WMP to do it automatically. When I contacted support, their solution was to suggest I either switch back to using iTunes, or retag my entire music library. I find these solutions unacceptable. Please update the SoundTouch Server software to handle this substitution for tracks where "Album Artist" is blank.
Note: The same above page might be another place to log this issue as a request/problem.