Today managed to do the autotune, first at level 6, which appeared to be too agressive for the frame, retuned at level 5. Indeed auto transition is way smoother now. But a new issue showed up. Now when launching in STABILIZE from the catapult the plane pitches down briefly on launch which is not good for a takeoff, it pitches ignoring my ELE stick input, after the pitching it resumes to the stick inputs and starts gaining alt. I wonder if there is a way to fix this pitching issue on start, other than launching in MANUAL, as I set the plane for some unexperienced people, for AUTO missions only.
Here is a log of one of the flights: