You've been here 2 years, according to your profile, written 16 hubs, have 24 posts in the forums and you are wondering why your hubberscore is low? 
Try writing more hubs, commenting on more hubs, being active in the forums, answer questions by writing hubs to answer them, taking part in HubMob and voting on HubNuggets Nominees.
It might help you to read the FAQ's page and even visiting the Learning Center.
Plus, you could also visit the Extreme Hub Makeover forum thread, to gauge whether or not, your hubs of good quality, by letting other hubbers critique them. The traffic you receive to your hubs and their scores play a factor into your overall hubberscore.
Just my thoughts on it. Enjoy. 