I suppose I can update my typing experience.
I finally finished the novel I was working on, 95% of it typed on the Keyboardio, which comes out to 80k words, plus other various things I’ve written on the keyboard.
By now, I’ve grown fully accustomed to the stock layout, with the only substantial modification I’ve made being the use of DualUse to set the Alt key to Enter on tap. Other than that, I’ve set up a few macros: Butterfly is em-dash, LED is cmd+delete (delete everything on the current line to the left of the cursor), and fn+6 inserts a heading at the current line.
I can reliably invoke volume and cursor keys without looking, as well as all modifier keys and special keys (including uncommonly used ones that are assigned to the function layer). I also no longer accidentally tap multiple keys, like I did when I first got the keyboard. I still have the habit of not efficiently using modifiers that are on both sides, such as control and shift, so if I want to hit ctrl+tab, I contort my left hand a bit.
I have it tented to the maximum angle the included stands will allow, though I plan on getting camera clamp mounts to give it a more extreme (>45°) angle. I float my hands anyway, so I shouldn’t have any issues with fatigue from that setup. My keyboard is split to the point that my forearms are parallel with each other and the floor, and I use a standing desk.
My WPM tops out at around 115, but my average is far lower—the bottleneck isn’t the speed of my fingers, but the speed of my mind as it comes up with the proper words to use 
. Accuracy is about the same as it was on my Kinesis, which is to say >95%. Most of my backspace use is from deciding to change a word, not fixing a typo.