It takes a while for the ratings to go up on a new Hub. I learned through trial and error that if I leave my hub unpublished for a week or more, the score will sneak up a bit at a time. After that time is up and you are ready to publish it the ratings will be higher.
During the time the hub is not yet published I usually edit it several times; You'd be surprised how many tiny things are missed and/or the thoughts you find that that can be expressed in a more creative or picturesque way. Proofing is vital to a high quality hub. Each read will inspire you to use your words as a tool to keep your hub understandable, intriguing and interesting.
Hope that helps Perspycacious.