Take the props off and plug a battery in. Go to the output tab tab in GCS. Enable Test Ouputs. Run the slider for each motor up individually and note the value that each motor starts. Slide each one up about 50% and note the tone/speed of each motor. Do they all start at close to the same value, and do they all seem to spin at the same speed at 50%? Also keep track of which corner spins with each channel number and post the results here for that and the motor start values.
Cheers!
LitterBug
Cheers!
LitterBug