Thanks for the response.
Regarding spotify URIs, do you mean this: track_id=spotify-WW:track:2EB1aFLWC4uIfld5Z3Yj1z vs this: track_id=2EB1aFLWC4uIfld5Z3Yj1z ?
If so, the latter didn't work when I tried it.
Getting static playlists in 100-song chunks with a taste profile -- will there be duplicates from one 100-song chunk to others? In the 2000 song playlist I generated, there were ZERO duplicates.