I just finished the break-in on the motor in my concept 30 SR. I am anxious to get it off the ground, but when I try it does something weird (to me anyways). Whenever I get to about half to 2/3 throttle (just before it lifts off) the tail swing around 180 degrees. I thought the gyro was supposed to prevent this. What could be the problem? The gyro is a Futaba FP-G154 rate gyro.