"But instead of reading books regularly, when I sit down with my tablet I end up reading Zite, Flipboard, and Instapaper."

This isn't a problem with self-published books. I don't have any ebooks at all. I have two full IKEA bookshelves loaded with actual physical books I want to read. But I don't read them as regularly as I'd like to. Why? It's because I don't make time for them, plain and simple. Same reason I don't exercise as much as I'd like to, or go on dates with my wife as much as I'd like to.

You have to set aside time to do reading, or any important task where the payoff isn't immediate (in seconds, like 2048), because otherwise it won't happen because there are so many other things competing for your attention.