Hi Sid,
I'm thinking you may need to look at balancing the blades. They're supposed to be manufactured to be exactly the same weight and at precisely the same angle in order to spin with no wobble, but hey, it's not a perfect world and sometimes the blades need some help. There's a longer discussion on the subject in this earlier question.
[post|749669|My fan is moving - Ceiling fan - iFixit|new_window=true]
As I mentioned there, Hunter has a video showing exactly how to do the balancing.
[link|https://www.youtube.com/watch?v=7WAXHiyPbTg|How to use a Ceiling Fan Balance Kit - YouTube|new_window=true]
Good luck; let us know what you find. Success stories are always appreciated and we can always learn something when it doesn't work.