I would add Tannoy’s to your list as well. Either the Turnberry or Stirling’s would be a great match for your Quicksilver mono’s. If you ever in Houston, come over for some Tannoy’s magic and Tex-Mex treats :-)
Coherency is the best way to describe a single driver speaker. The sense of integration clearly affects how the listener perceives the treble, midrange and bass response. Speaking of Devore and Tannoy’s, there is no trace of ‘one-note’ emphasis that some speakers exhibit. Instead, you get natural detail with excellent pace, rhythm and timing. Once you hear a single driver speaker, all else pales in comparison, IMHO.
Also add, Cube Audio’s Nenufar to your list.