My quadplane nearly crashed after the transition. It dipped below the required ALT_Assist level before climbing back up. it was its first flight ever. Looking at the log, the flight was not smooth, had a lot of ripple-style flight.
this is the log file:
You need to tune it.
First Q mode:
Then Fixedwing mode.
Also want to say, that a first flight using auto mode is never recommended. You’re pretty lucky it worked.