Like molevitch already said, issues with your pedal/yaw behaviour is that yaw AP channel default mode is heading hold. On Russian helicopters, once yaw channel servo runs out of its authority, system will move pedals on its own to re-establish that authority.
There are 2 solutions:
- change pedals microswitch logic to "microswitches off" and bind a toggle switch to keep microswitch off (that way, yaw AP will work in dampening mode only)
or
- disable yaw AP channel (you will have no dampening).
As for your other problems, it would be best if you record a video or post a track file here, so we can check what is going on.