Since the last post, I replaced the 3 in 1 with a Brushless ESC and motor and used a Pixie 20 brushed ESC and am using the stock tail motor. Going through the 3 in 1 worked, but I didn't like the two gyros fighting eachother.

Mdaitc- could you describe your setup in greater detail? Does your gyro have a connection for remote gyro gain and are you using it? If you dial the gain down, the tail wag should go away. My Eflite G90 is set to about 60% and as of the last flight (last week) it had no tail wag.