If your hands don't get cold, then it was better to trade for Jet Fins.
As for narrow sleeves, the Viking bayonet system or the OS Systems ring set may fit. They are smaller than the DC rings.
If you're curious, ping me. I should have spare rings to test fit. I don't have a complete system to try unfortunately.
Thanks Don, I might take you up on that at some point.
I took the jets into the pool tonight to compare with the Hollis F1s. They're very similar in most respects. The F1s are a bit more comfortable around my drysuit boots due to a more modern/generous foot pocket design, and the spring straps are significantly easier to doff/don. I think I prefer kicking the jets a little bit more though. They're slightly shorter, which makes the loading stroke a bit less cumbersome on almost any kick I tried.