Most Helpful Girl
I do that too, without even realizing. It's actually really annoying because people think I don't like them because of it. Saying that, it would probably help you to try and improve on it, although I'm not sure how. It serves as a whole other non-verbal communication technique, which is very helpful. It also really shows that you're listening, and I think everyone likes to be heard. To try and improve, the only help I could give you would be to keep in mind your "faulty" eye contact situation so when you are talking to someone next, you'll remember to look them in the eye and after awhile I would think it would become a habit. Anyway, lots of luck :)
Also, if you find anything that helps, would you mind telling me?