Awesome, that was actually pretty easy using the Chrome app. I reversed 2 & 3, so they now spin correctly.
To stop motor two twitching @ 1137, I went back into the ESC config and tweaked the ‘PPM Min Throttle’ on ESC 2 from 1148 microsecs to 1152. That particular spasm has gone away, and they all start spinning at 1153 in the Betaflight software.
I reckon I’m good to go! Thanks for the pointers (again!). Will try and get out with it this weekend. Will prolly order some more props on monday lol.