Nobody knows and it isn't really important. If you have been a member for two years and have over 200 hubs, your guess is as good as anyone's. If hub writers really knew what the 'system' was, the score could be manipulated.
You might try adding some photos, graphics or videos to your hubs and see if there is any difference. For instance if you are talking about drawing a diagram-- you might show an example of a diagram to enhance your point.
Do your best, keep improving your hubs, and be happy.
Hello guys!I just started HubPages less than a month ago so I'm fairly new and might not understand the way HubScore works like you do.I have published 5 hubs and I published my 5th hub yesterday. My fifth hub is called...