Pay more attention to the technical aspects of the hub. For example, creative use of several capsules, breaking text up into smaller paragraphs, good images that are related to the topic content, and of course spelling, grammar, and sentence structure.
I am learning that you can have the best content but it has to be organized in such a way that will get traffic, a good QAP rating by HP, and a decent hubscore.
I hope you meant "hubscore" and not "hubberscore." All of the above will help with both. But for hubberscore, it helps to be involved in the community. However, it changes like daily underwear so don't sweat too much trying to increase it.
I've let go of my hubberscore obsession and wait for that "88" to go back to 90s soon. For the most part, it has a mind of it's own regardless of your activity.