Organizing unofficial music releases so Plex handles them correctly

Sorry if the title is a bit of a mess, couldn't really figure out how to properly describe the issue I'm having. I have a bunch of songs that are not official releases and Plex keeps fudging up the metadata/organization. The artist is Mac Miller - if anyones followed his posthumous musical career, you may know there's been quite a few "unofficial" leaks. I've been collecting them and Plex doesn't seem to know how to handle these and I'm sure it's partly because of how I have them organized. I currently try to follow the official naming convention which is: Music> Artist> Album. For the unofficial leaks, I just have an album level folder called "Unofficial Leaks". Plex keeps combining this album with his most recent album "Circles" as well as breaking this out into multiple albums called "Unofficial Leaks" with a few different songs in it with there being like 3 or 4 of these albums instead of one. Does anyone have any suggestions as to what I can do to prevent this from happening? I've also tried to edit each Unofficial Leak song's metadata on a per song basis in Windows by right clicking the song and going to Properties, and then Details and editing the artist, album, year, etc to help Plex correctly organize these.