APM 2.6 motors accelerating from 0% to 50% of throttle and not between 50 and 100%

Hi, I'm building X quad with 1000kv motors and 9443 props with APM 2.6. I want to fly with 2x 5000mah batteries but I'm getting only half of my motors power and quad is barely lifting itself.

I've checked ESC and Radio calibration and all seems to be

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