Dual heli yaw dificult to tune

Hello,

I tryed to tune yaw on my dual heli (chinook type) and it remain dificult.

I played with YAW FF and with rate yaw d without good result.

The heli wooble on it’s yaw axis…

Can you please help me to fin a way to tune it ?

You will find below the dataflashlog.

Thank ou for your help.

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