Hi @dubatc, Plexamp radios and shuffles already preference your higher rated music over lower rated or unrated stuff. If what you want is to just get a mix of everything you’ve rated at 4 stars or higher, for example, you could create a Smart Playlist.
There’s a really handy guide to that here.
The short version: in Plex Web, create a filter for Rated tracks, and save it as a Smart Playlist, like below. Smart playlists automatically update themselves as more music matches the conditions of the filter.
Once created, the new playlist will appear in the “Recent Playlists” section of the Plexamp home screen 
