Issue with generating lift for turbine-heli aircraft


I am currently working on the flight model for an AS332 L2 multi-engine turbine helicopter, and have issues getting the model to lift from ground.

I have used some multi-engine helicopters as basis for the flight model and engines configuration, and engine power / rated N2 values set based on aircraft POH. It seems the issue might be related to the throttle not increasing high enough when collective is increased.

I have attached a link to video showing the engines debug output when trying to increase collective (helicopter moves forward on ground, but not generating enough lift). What would be best way to debug the issue, and which parameters might need adjustment?

Video link:

Any information would be greatly appreciated.