From what I've seen on HP the formula for figuring out scores (whether for hubs or your profile) seems to be a mystery, or at least a well guarded secret. What I have noticed in my own writing is that the more interest a hub sparks is improtant, but then do those readers stay and read the whole article? do they submit comments on it? Do they vote on it (up, down, useful,etc)? Your involvement in other activities on HP is also important, because as you answer questions, ask questions, contribute to forums, and actually follow the people you "follow" more people will do the same for you.