I forget exactly which video Troy made this particular observation, but it was something to the effect that pickslanting actually had less to do with the angle of the pick, than it did the picking mechanic and the pick coming up and away from the guitar on upstrokes. I’ve been thinking about/watching for that more closely over the weekend, and I think it’s starting to come together for me.
It’s still not perfectly consistent… But, it’s eerie how effortless string changes suddenly feel, it’s like there’s no resistance in your pick stroke. It’s kind of crazy. I know that the whole premise of Cracking the Code sounds a lot like a fad diet or a clickbait article or something - “Guitar teachers don’t want you to know this one weird trick that helps you pick faster and cleaner!” - but sure enough, the mechanics make perfect sense, and you can kind of feel it, as your pick stops getting hung up in faster runs. Makes you want to practice! 
EDIT - I guess, in a nutshell, the single biggest thing I’m surprised to notice is that alternate picking always felt like something I had to have my arm tense for to do accurately, yet when things are flowing, suddenly the more relaxed my picking hand is, the easier it is. That’s exactly how technique SHOULD work, so I don’t know why I’m so surprised, lol.

It got a lot clearer in the Pickslanting primer stuff, and then the mechanics just needed some time to percolate before it started to feel natural.