PIXHAWK + S900 Problem, please advise

Hello, please help me.

I am trying to flight DJI S900 with PIXHAWK, but I have serious problem. RC controller is Futaba T18SZ. When I tried to take the drone off, it did not take off straightly, it leaned to the right side. However, once it took off (I controlled precisely to take off with problem), it looks fine to fly. I tried to take the drone off more than 10 times, but same problem happened.

I uploaded hexacopter firmware (APM:copter V3.3.3 Hexa) from Mission planner, and I calibrated accelerometer, magnetometer, RC, and ESC. I connected the motors with Pixhawk as below. I think I set up the drone correctly.

Pixhawk Motor-Out
S900 ESC
1
M6
2
M3
3
M2
4
M5
5
M1
6
M4

Please see logs I attached. As seen in the first log, I did not control roll, pitch angles, but ROUT signals to motors have gap as I increased throttle. I tried in altitude hold mode, stabilize mode and the same problem occurred.

I also attached a top side picture of my drone. Is there anything I need to do more? Or I did wrong? Thanks for reading, and please give me advice.

log1.JPG

20160623_222330.jpg

log2.png

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