I have the same experience as you do with the Atomic line of regulators. I do keep and always use the sealed FS however.
My question to you is why would one upgrade the Z2 and add the swivel turret to the FS, wouldn't that make its cost VERY close to the B2? If I wanted a swivel turret, I'd just buy the B2 from the beginning.
(What I don't like about the Atomic product line is the that the SS hose has the permanently attached swivel that makes the hose and changing the hose extremely expensive. If the swivel were independent of the hose, it would have been most ideal).