New - Missing Something

[DroneVantage]

Hey all, glad you are here because I really need some help.
I am new to multirotors, originally a filmaker but have always been a tinkerer. I started with a Phantom 2 and was hooked. I tinkered and modified the Phantom until I needed to step up to something more professional. I have been flying the Inspire for several months and have really needed to carry larger cameras. So, I decided to build a heavy lift machine from the ground up.

Here is what I have assembled:
Gaui MRT 1300 "O"
DJI A2
T-Motor U7
T-Motor 18x6
T-Motor 80A ESC
2x Tattu 6 cell 22.2v 1600mAh Lipo's
Futaba 14SG

I have finished assembly but it seams like I might be missing something. I took the machine out for the maiden flight and as I throttled up I notice the aircraft wants to pull a little to one side instead of strait up, but not all the time. Because the aircraft seamed like it might not be operating properly I strapped it down to a work bench so I could give it a little more power and observe its behavior.

Again, its running but judging from my little experience with the Phantom and Inspire, the motors seam like they might be a little out of sync. The IMU is in the center of the frame, oriented and calibrated. I feel like maybe I have missed something with the motors or ESC's. Again, forgive me if I have missed something simple but this is my first rodeo.

Thanks for your help!

 

[DroneVantage]

Nevermind, she's flying like a champ.

 

[Motopreserve]

Did you calibrate the ESCs? The calibration done with ease servo plugged directly to throttle out channel of the Rx.

 

[DroneVantage]

That was it Moto.
Tx on, throttle up, power aircraft, ESC's made a different noise, throttle down, power cycle and it worked like a champ after that!
Thanks for the input.

 

[Motopreserve]

That's the one!

 

[SleepyC]

U7 490 or 420?

The 490's DO NOT like 18" props. Watch the temps on your ESC's. I had 3 of the 80A Pro ESC's melt the shrink wrap off and I was hovering at 48% - 51% on 18's. Switched to 16" props and went to 62% hover and they are much cooler... (still hot though, T-Motor told me "It's OK, just fly)... not a fan anymore...