Got kicked out of Acro Mode during turn rate tuning. Need help

Hello, I am doing my first tuning today and using ardurover 4.4. It is a vector thrust jetboard that can run at 30knots, and is currently weigh around 50kg. I am able to follow through the throttle tuning, but it wasnt running a straight line when i am turning on throttle during acro mode.

During turn rate tuning, I got kicked out of the acro mode back to manual mode very often. I am able to do a half circle turn, then it will stop steering and just move straight despite i am still sending turning command.

Can I understand what are some possible causes that could cause it to kick me out of Acro mode and back to manual?

I have been stuck on this issues on a couple days and would really appreciate any help or insight.

Adding the bin file here

Would like to close this as this has been resolved. I realized it was the setting of ch_mode interfering my acro mode with my throttle rc_in.

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