Hello,

Maybe I miss-read this but your are not setting the brakes.
* Turn on the receiver and press the set button (for 3 seconds) until it blinks blue
* Hit SET again and neutral is set, it starts blinking yelow
* Hold full throttle and hit set again. It now blinks red
* Hold full breaks and hit set a last time. <-- I think you forgot this step.

After that it should be calibrated correctly.