Your hub score is contingent on the make-up of each hub based on Hub-pages ideal hub structure, if you search something like(ideal hub structure) or something like that you will find a hub that is recommended as having the preferred modules and there are some helpful suggestion there that will really help your hub scores.
also interlinking your hubs with relevant hubs, mostly your own is part of your score and it will help with traffic. (find this under hop a hub)
The hubber score is based on your profile's completeness, regularly publishing hubs and the level of activity within the community such as commenting, getting comments on your hubs, asking questions and answering questions. This sort of like becoming an asset to the hub-pages community.
Publishing quality hubs helps everything, and the more buzz you create, your profile score will go up as well.
Blessings upon your writing.