Pixhawk+hobbywing x-rator 40a ESC, won't lift off

Hello, I am a newbie to pixhawk, and I was mainly using DJI FC previously. Recently I made a customized quad with pixhawk and hobbywing ESC, with the T MOTOR MN4014, everything was ok on ground test, but it just won't lift off, and I am pretty sure it's not the problem of payload (zero payload). I've checked the spinning directions, ESC calibration, CW/CCW props...

So I put the stuff on the F550 hex to check if it works, and again, couldn't lift off even at 85% throttle! the motor feels really hot after the spinning.

Now it seems the esc is the only suspicious thing, I noticed that they come with only two wires on the pins (GND and signal), is that the problem? But the ESC calib was successful and motors start/stop at the same pace...

I am really frustrated these days messing with all these stuff, any help please, many thanks in advance,

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