To not add to the other answers, but one thing was left out. You are allowed two links to any single domain per hub. However they warn you not to link to the same domain too often as "a single domain rarely has everything needed on a topic" per a quote from an email I got from them, when I asked a similar question.
Make sure your linking not to the blog itself, but to each individual post should help. Use the ability to have links in your profile, to link to your blog.
Hope this helps