First, any of sensors isn't red.
If you import your uav file, all is ok.
I'm not english and for me is not easy to write a long stories.
I will say, I have read many informations that I found through google, on internet, youtube. Nothing give a good, reliable result.
I have repeated many times the wizzard of Librepilot, no result. I think that most important are throttle chanel and yaw channel.
I have introduced different values for minimal and neutral value for throttle and diffrent combinations. No reliable result.
I'm like very much program Librepilot and before Openpilot. Have many of respect for his authors.
But this story with arming is not new and I hope finally will find explanation. I will work on this as well.
Thanks for interest.