1: I have 5.5.0
2: Could be any height, but mostly 20+. Last time was 35 and 40, at 0.15mm layer height
3: I have gone through the manual calibration to even it out, but always Auto-level as it starts up.
4: single core prints, it embeds the printing nozzle.
5: left.
6: Nope, I don't swap. It came with BB in the left, and AA in the right (used), and reading the manual, I saw that AA should be left, and BB right. I have no issues printing (well, on general) like it currently is.
7: 5mm from the top of the lip to the bottom of the hot-plate. Picture looks near even!
8: I have used Pause at Height, and it did the same thing. Using Griffin M0 (firmware retract) method.