OK, so did a gig with my Realistic violin bass and the new Hofner Labellas. I like that when you grease them up they actually lose a good amount of zing immediately. It had deadened D'addario Halfrounds on it, which sounded good but were always a little too ringy. I don't think that'll be a problem with Labellas. Had a problem with the G string in the set I got for my P Lyte, but they're sending me a new one on Monday, and judging by the Realistic, they should be perfect.
Don't know that I'm going to put them on all my flatwound basses, though. Thinking about putting my 13 year old set of Fender flats on my 76 PJ, even though they're 45-105. And the Labellas aren't as middy as the Chromes or Halfrounds so I'll probably try the Chromes on the Longhorn first since it's pretty mid scooped.
Anyway, I think I'm through updating this thread. Looks like I'm all sorted now. Thanks for reading, sympathizing, and suggesting stuff, everyone!