This is a quote from him, "Through the transmitter, turn the E-Flite heading lock gyro up to 100% in heading lock mode. By itself this would be too high of a gain adjustment and the tail would wag. Turning the 3-in-1 gain to 20-25% gain actually eliminates the wag and allows for a higher gain setting for greater holding power. This occurs because each gyro operates at a different PWM frequency, allowing the two to work together to produce an amazingly smooth tail response with aggressive heading lock authority."

Nick