throttle problem with pixhawk

Hello;

after doing the sensors and the esc calibration in mission planner; i observe that motors spin with a higher velocity at the minimum of throttle , this problem caused the crash of the hexacopter when i try to fly it .
have you an idea about this problem ? 
i use this esc AKE 40 A for the hexarotor tarot T960

http://www.hobby-wing.com/ake-highspeed-40a-esc.html

this problem is described in this video :
https://www.youtube.com/watch?v=dE2I6hVEc4Q&feature=youtu.be

thanks

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