When you are using trim to set ATTI and MANUAL make sure you go right through the blue box and count the number of clicks while the box is blue.
To find the range/length of the blue box in clicks then set so is middle of this range.
I notice on mine that the blue does not light up untill i am...
It does not matter what the value is as long it is above the 10% cutoff value and less than 50%.
When in failsafe the Naza takes over control of the throttle so that Tx throttle position has no effect.
Thinking about it, may be this is what happened to you.
Naza went to failsafe and ramped up...
Can you try turning the Gps/compass module about 20 deg to the right, point the arrow to the right.
I am interested to see if this makes the effect better or worse.
Should only take a few seconds to give the unit a quick turn then test fly.
Simple test procedure before flying a new copter for the first time.
On frame near motors mark rotation , felt tip pen or whatever, using instructions for correct rotation.
Run motors WITHOUT props, at low speed, touch each motor with the end of your finger to find direction.
Shut down...
Is it possible that the nut is tightened too much?
It is my understanding that it is the "Flats" that prevent the prop from rotating on the motor shaft.
The nut is only to keep the prop on the shaft, there is not much surface area for the prop to lock onto, in a gasser there is a
large hub area...
Just a thought, try turning/rotating the GPS unit about 20Deg to the right, ie.The arrow points 20deg to the right.
Unit is trying to get to GPS position but GPS/Compass unit is messed up by amount of magnetic declination in NZ.
Thinks it is heading to center but is actualy 20deg out on course...