Wow, I just ran across this string and RobertA_Rieke's video. I REALLY wish these pot tuning instructions were part of the setup instructions. I know I would have had a number of less headaches, if I'd done this during setup.
On another note, I'm also not sure why an actual squaring of the Y-axis motors isn't part of the setup instructions. Perhaps I'm dense, but I'm missed that until I was doing a longer cut this weekend and noticed my Y-Axis wasn't square to my wasteboard. Meaning the two Y motors were not square to my board. There are steps in the instructions on squaring Z and X, but Y was an easy adjustment using the wasteboard lines. Again maybe I'm just dense on that one, but I missed it and it would have been a easy steps to ensure the CNC is setup correctly. Just like the pot tunings. Suggested enhancement to setup instructions.