VTOL control FBWA with four tilt motors

hello, this is my VTOL project its name is PAWAK, and I have questions regarding the FBWA mode? My VTOL has the four pitch motors for the transition from quadplane to plane. I work with this configuration, but it has problems with the yaw in the plane, the parameters generate a differential thrust of the horizontal motors to make the yaw movement. Sometimes this configuration generates stall speed in the yaw.

PAWAK VTOL

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