Actually I've made just the title and came back two or three days later to do some work on the empty hub and the score had raised at least 6 or 7 points! The hubs keep rising! It really doesn't have anything to do with content until you publish it! It has to do with visits! The more you click on it... the more it will go up.. that I know for a fact! I noticed the more I went in there to work on it... such as in and out during a period of time doing work and have to stop and save and come back... it would go up even more!
What I do is decide what I'm going to work on... make the titles and work on the hubs over a few days... sometimes i will have 5 or 6 at any given time... but I only publish one a day! By the time I publish one the score is already above 60... sometimes higher depending on how long it takes me to finish it!!