Delta 10 is more like 7 (x() x10 (y) as it's a proportional font and I added 2 pixels of vertical height to it to make it look better on modern displays.
As far as the mobile columns value, start with 36 and work your way down. I recommend taking a screenshot of the current screen so you can remember the current text density when making a comparison for how it looks.
I sent you an email with how to resolve the desktop scaling.
Everyone else, once this is resolved, I'll update the documentation on scaling so the information is not lost.