No idea on what your problem could be....is the Airtronics Analog ? that could be the problem right there....as im assuming the Hitec is Digital....as for the Futaba option...i will only reccomend the brushless 9451 for throttle...as ive personally seen the 9351 fail on Multiple occasions on steering duties....couple were gearset's....couple were case failure's......i would stick to what you know.