Weird pixhawk lazy motor & drafting

hello, I am a newbie with pixhawk and was using DJI FC previously. I found something I can't understand regarding the lazy motor. The problem is, there is always at least one 'lazy motor' no matter with a hexa or quadcopter (I tried three airframes), and the copter would draft to the lazy motor direction due to its much less power generated than others. Specifically, the lazy motor stops early and give less thrust than others but they can all start at the same time.

the reason is not like popularly discussed esc calib issues (the ESCs were already calibrated). I would assume it's because the level calibration, however, even after adjust the position of the airframe to make it lean to specific motor on purpose, and the position of the lazy motor still remains unchanged. I suspect it's the problem of the pixhawk servo ouput pins, but I tried different pins and the lazy motor was still that one.

What bothers me most is, it's not like some users discussed before that it would be all right in the air--it drafts significantly on stabilize mode! Yes I can just always use the loiter to lock its pos, but is that the only option we can have? It really confused me that such a popular and robust product would come with such problem!

thanks in advance any help please, 

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