Thanks @meeera , that's useful.
I've looked into Calibre and yes it does turn out that I'd been transferring/converting to epubs rather than kepubs. I thought I had all the requisite plugins installed, but apparently I hadn't. I had naively assumed that Calibre would "do the right thing" and know the best defaults for most common devices.
I also stopped trying to tap-to-turn and just swipe and that works better too.
(My delay in responding wasn't due to petulance, I just got busy and had to look into the Calibre configuration.)
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