I always do it exactly as it’s done on the release. Bandcamp has “Schlachthofbronx” as the release artist and no individual track artists, so “Schlachthofbronx” is the track artist for all of them.
You can add “Toddla T”, “Canblaster” and “Myd” as remixers in the relationships.
For track 3 the title is “Wave and Wine (Toddla T remix)”.
PS: Seems you already did it all correctly anyway: