Calibrating throttle quadrant

Hi,
I use the Redbird TH2 throttle quadrant and even if i calibrate it, i unable to get full power or full propeller pitch. Levels are at the maximum on the throtlle quadrant but not at full power according engine gauges.
For exemple i should get 2500 RPM (Mooney Ovation) and i only get about 2380RPM. I’ve tried to adjust them through the sensivity but it changes nothing. Any body who could help me. Many thanks.

Real Deraps

Moved to Self-Service, peripherals. #self-service