excellent! For those who missed it, video is here:
Did you just configure the motor tilts as elevons, or did you mod the code to do vectoring separately?
Can you put the DF log somewhere so I can take a look? Get it from the SD card, or download it over MAVLink with MissionPlanner.
yes, looks like the differential thrust gains are a bit high. The logs will show the contributions to that from P, I, D and FF (in the PIQR log message, which logs roll PID elements in hover). From that you can probably work out what to change to fix it.
yes, transition will be automatic, just change to FBWA mode.
I should have a first cut at support for vectoring in the code done soon. I've built a model in FlightAxis, so I have something to test now.
Welcome to ArduPilot!