Okay, do this. Set position 0 to 30, position 1 to 40 and position 2 to -40.
When you are in the positives, you are in HH (heading hold) mode. When you are in the negatives, you are in rate mode. When you plug in the heli, make sure you are in pos 0 or 1. If you have to move the heli, the tail will be pushed to one side all the way (that's the way HH works). To center it easily, just quickly flip your gyro switch to position 2 and back to either 0 or 1. This will center the tail so it's ready to fly.
Now that you have some gain on your tail, give it a shot. The tail will move just slightly when spooling up (thanks to the awesome ESC) but it should hold pretty well. If it doesn't, we will work on that. Just remember, don't use any trim on anything with a 3 axis gyro.