I was trying to hover my Raptor 30 V1 first time today. In general it was OK, but the only one thing really scares me it the tail rotor. In about 40% of throttle the tail start moving right and left on the very hi speed, but when the heli gets to the air it seems to be OK. It also works better when I have the HH on. What is the problem? I am using ICG 400 gyro w/ 9402 futaba servo.