Hi Eric, I'm not sure we can say that HP isn't doing it right if we don't understand what they are doing. I think they probably have a lot of factors that go into calculating the score. Until or unless we know what those factors are, we should withhold judgement.
My hub score drops little by little with each flash fiction story I write. I try to throw in articles that HP and Google will like in order to keep my score up, but it is an uphill battle. Actually, I shouldn't care about the numbers. It's probably simple pride that makes me try to salvage the hubber score.
Eric, you have awesome articles. Lots of people enjoy reading what you write. Keep doing what got you a good reputation here and let the things that bug you go. Sorry, I don't mean to preach, but you've done well on this site and I'd like to see that continue.