If you remove the Album Performer (and any other track performers), the spaces will not be added to any of the Performer fields. It’s not a solution, and I don’t know why it is, but that’s what I found.
I don’t know if it’s “actually” on the DDP either or if it’s the import process. I tried making a CDR (which exhibits the same thing) and reading back the Text using the Mac command line CD Text command and didn’t see anything unusual, but I’d have to try that again. Would be interesting to see what Hofa and Sonoris do with it.