Here let me confuse you even more - LOL. I just glanced at your hub scores and they sit pretty nice. There are oddities. Like poems generally get lower scores. Why? - ?
I posted an article in 5 parts since it was way over 3500 words. Each standing alone are about the same in score, except one, which is lower - content I believe or subject matter. The conclusion has the highest. Oh,and there are not any comments on any of the five. Only one notation - useful. But it was a tough subject written academically.
Comparing that with my other hubs, I have learned it is views & interactions with hubs that leads to good initial scores. And I have a wild guess that the law of averages cause the little drops and raises. Where the averages come into play who knows. I have hubs that have been steadily getting higher as weeks pass by. But, generally my hubs begin low on the totem pole with initial exposure or reader demand.
That was long, I apologize I was trying to reason with myself. Bottom line - supply and demand. Fill the niche or supply the demand, which you have done well - congrats!