Cannot get sufficient deflection on Vtail

I am setting up a Vtail fixed wing with a FC (Matek F405 Wing V2. The servo output is set to 1100-1900 however when using the stick on transmitter I can only get 1300-1700 on the Vtail. The ailerons are fine with 1100-1900. Can I get the Vtail to use full range as well (1100-1900)?

Video: Videolink

Setup: BIN

Try increasing the MIXING_GAIN.

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Thank you Allister, that solved the issue. I increased from 0.5 to 0.7.

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