MultiWii PRO Flight controller problem on Quadcopter. Motors not consistant.

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Problem with my MultiWii PRO Flight controller.
After setup of the board. Calibrating ESCs. Calibrating ACC and Mag. 2 motors run fine. 2 do not start up until much later on the throttle curve. If you run the escs and motors individually off the receiver they all work fine. Have tried multiple configs on the controller and all have the same problem. D6 being the worst affected. Have tried both 2.1 and 2.3 code with same results. If you move the ESC cables around the problem follows the connector on the controller.
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