does it wobble? If it is not wobbling and just humms, the only option is to buy a higher quality fan. If it does wobble then you can try balancing first. there should have been directions for balancing in the box. it takes a long time, but is worth the effort.
It's not wobbling. I'm going to see if it breaks in after a couple more days, and if it it's still bothering me, I'll see what's available at local lighting stores.