Pixhawk + Castle Creations Quadpack 35 Problems

Hi all,

  Apologies if this has been tackled somewhere else, I have found similar topics but not this one in particular. 

My setup is a Pixhawk + a set of Castle Creations QuadPack 35A + Leopard LC2835-5T motors. My problem is the following: Everything arms fine but when giving it a small amount of throttle (~20%) from my RC three of the 4 motors spin correctly. The fourth motor does not spin until the throttle reaches about 50% or more and then the four motors spin. Further, when bringing back the throttle to 0%, the not all motors stopped immediately, they stopped eventually after some 20 seconds.

I have read these ESCs have fixed endpoints but I have already checked using Mission Planner that the values read into the receiver are 982 and over 1980 for the 0% and 100% throttle, respectively. Finally, when the "not moving motor ESC" is directly connected to the RC receiver it displays the expected behavior when moving the throttle from 0% to 100%.

How can I fix this issue so that the four motors spin correctly?

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