So I reviewed the key bindings and played a bit with sensitivity, even loaded the default profile for my flight stick. Nothing changed and the helicopter started to behave erratically when hovering as soon as the instructor gives me back the stick control - i did not have that with rudder controls for ex., when applying counter force it was perfectly manageable.
I also tried from free flight and with different helicopters but no, still behaving erratically in hover mode. Strangely when started at a higher level (so no hovering) it is perfectly flyable.
I’m perplex with my issue, reading several good feedack on the forums on the helicopter flight model 