I think the key to having a high author score. . . .besides publishing good hubs; is to ask questions, answer questions, comment and give feed back to other hubs, use the forums; etc, etc, etc.
I can't prove it, but I'm pretty darn sure that the more features that you regularly use on this site. . . .the higher your author score is.
Of course the single best thing to do is publish better and better, and more and more hubs.