Transwing reduction of inside motors speed in FBWA mode

I am configuring my quad 4 motors (Frame type X) Transwing with the aid of Simulation in Mission Planner and everything goes fine until I try to reduce speed of inside motors 1 and 3 in FBWA mode. Q_TILT_MASK is set to 15 (tilt all motors)
The controller was not able to sustain this reduction and start spinning in all sides.
To succeed a flight in FBWA mode I have to reduce motors 1 and 2 that is a non sense for a QuadPlane like the Transwing.
Have you an idea of what may be wrong ???

Here is the problem when reducing 2 of 4 motors in FBWA mode for a Quadplane.
I use the Lua script from Pterodynamics to reduce motors.
The first screen shot shows the problem with elevator going high drastically when the motor reduction starts.

For this second screen everything goes fine with the replacement of motors 2 and 4 with motors 1 and 2 (that is a nonsense for transwing type of Quadplane).


If someone have an idea what causes this situation, I will appreciate.
My transwing quadplane is ready to takeoff but I want to complete this simulation before putting everything in my Pixhawk 6x controller.
Here is the parameters used for the test
And the LOGS for each screenshot
2024-12-28 22-57-59.bin for screenshot 1
2024-12-29 11-16-32.bin for screenshot 2