I am flying 2000mm wingspan trainer fixed wing with a gasoline engine fitted with Pixhawk Cube (Plane 3.8). Issue I am facing is of Throttle during Auto mode which stays at high always. During descent waypoints specially auto land though altitude decreases but speed gets abnormally high crossing over 45m/s. Cruise speed is set to 20m/s but it never locks on that speed and mostly fly at over 30m/s.
Already done airspeed sensor calibration, even tried disabling airspeed sensor and used GPS alone. Did tuning of pitch and roll but still not getting any success.
Can you advise all parameters that affect the throttle functions just incase i have missed any crtical one.