Kin Hell: I can confirm that the U2410 supports below 30kHz as that was the whole point of this thread!
Methanoid: I don't have an Amiga set up at the moment, but I'll try out some different screen modes later when I get the chance. I can confirm that DblPal works; there's a photo of it earlier in this thread, but the monitor seemed to be stuck in 'widescreen' mode which didn't look too good.