Hello,
The gain parameter in KR timer is a "double edge sword".
Increasing it's numerical value will add RPM when the system wants to draw more current, for example when the model is entering the Wing-over.
Unfortunately, this RPM increase is not reasonably stable for higher gain parameter values while the model is climbing.
There exists RPM fluctuations that are clearly audible.
This has to do with the dynamic properties of the PID systems.
The highest gain I consider acceptable is 4.
Matt