Throttle oscillating up and down - normal? config problem? hardware problem?

I would greatly appreciate feedback on how my logs look based on this flight. I have put together a video including FPV video, ground video and Mission Planner data, and the complete log file. Input on my build is greatly appreciated!

I noticed the throttle rapidly oscillating up and down at a few points in the flight and don’t know if it’s normal, a config problem or a hardware problem.

also, the pilot felt it was very reluctant to bank while in Cruise mode. perhaps that’s my mistake for using cruse mode instead of FBWA mode. In manual he had lots of control, but in cruise mode, it did not want to bank much and made wide 50-75m radius turns.

flight logs -
video of flight -