Gary, We have the wookong imu. After searching the web it looks like the oscillations could be a centre of gravity issue on the Y and Z axis. On the Z axis where is the cog measured from. Is the centre of the copters core ie where the booms are. Is it combined with the camera gimbal etc.
Colin thanks. I don't know enough about the Wookong to help you. Maybe someone else on the forum can give you some input.