If the OP is really married to the 3 rim, he may find that the Curry line requires dropping down a couple of sizes or so to get the same feel, but that's all based on just which Bach 3C he's playing now. As far as the 3CFL being the logical place to start, my offer still stands if the OP's interested in it. I notice that you play a 3CFL yourself, presumably on that Getzen 896. More power to you. That's probably a pretty decent match. For a ZKF-1525, which I also happen to play, I wouldn't touch that Bach mouthpiece on a bet.
(Just for the record, I'm a flugelhorn freak - currently own 18 of the things although I have to count Kuhlohorns, Eb soprano flugelhorn, and slide flugelhorn to reach that count. Two of them are Getzens, one of which is an 896. It desperately needs to be restored, but would cost more than the horn could ever be worth to have the work done, so it sits here waiting for its chance to be tossed in as an extra in a multi-horn swap some time. I don't like the horn well enough to spend any money on it. Sorry. Nothing against Getzen, but we were talking about a Kanstul ZKF-1525 here, and that's one of my top two flugelhorns and one I've spent plenty of time with. I know a guy who plays one with a Benge 5CFL. I just don't care for the tonal quality with that, or with the Bach 3CFL - I've tried it, and hated it.)