I've been able to dampen wing rocking by using the sticks. Just bump the aileron stick to one side to level the wings and put the stick back to neutral. This is usually sufficient to stop it. You may have to keep doing this until you find a stable harrier. Once you use this technique you can find the sweet spot by adusting the throttle, elevator, and rudder. After a while it's just like hovering, you don't have to think about it. I also use the elevator to stop rocking. Just let off elevator then back on it. It works. I was doing it all day today.