I think the central hypothesis of using these keyboards is flawed. It seems to all centre around thinking that less movement is better, and that keeping as close to the home row as possible is king, even if that means chording, contorting your hands to reach far keys, and over-relying on your weak pinky fingers.
Human bodies are meant to move. I've found that since I've started dancing over keyboard more with my fingers (a sort of advanced hunt-and-peck using all fingers but the pinky), combined with using a low profile keyboard, my hand pain has disappeared, and I'm at my fastest WPM yet (105). YMMV of course, but it's worth considering if you're peering into the rabbit hole.