Good luck putting your JP374 through its paces (and good luck in your recovery). Way back when I was trying to decide between the JP274 and 374, I was swayed by the review Matonizz did on the 274; and he still uses it as his backup horn and in some cases, as his demo horn in duos he does with one of his colleagues for his Patreon followers. I think you'll be quite happy with the 274. But with the 374, you can experiment with the tuning slide, so having both is not a bad condition to be in. As for the Carpal Tunnel, best of luck. As our bodies get older, they complain more.
Arnold (Arnie) Williams
Sterling Virtuoso Euphonium with Gold Brass bell (Capitol Pops Band, Capitol Pops Tuba Euphonium Quartet)
Yamaha YBH-831S Neo Baritone Horn (Joyous Brass, First Baritone)
Yamaha YBH-301M Marching Baritone (Ophir Prison Marching Kazoo Band and Temperance Society LMTD)
Yamaha YEP-830 Xeno Bass Trombone (Sacramento Concert Band)
Euphonium: DW Heritage 4AL (main); K&G 3D (Ophir Prison Band)
Bass Trombone: Ferguson M Series Jeff Reynolds