Anyway, here's the deal.
You have clearly thought a LOT about this and have all the elements in place. I'll just suggest a few different ways of thinking about what you wrote above.
1. Publishers don't care about your posting rhythm or how many Twitter clickthrough rates. In fact, many don't even care about your book topic.
They care about your platform and how well other books in this vein have done.
I noticed that you yourself indicated that there are few books on failure, while many books on success. Why do you think that is? What would make your book different?
2. A series of musings is usually a very bad book. Who is the market? Do you already have a presence there? For example, publishers started approaching me once they noticed that iwillteachyoutoberich.com was popping up in the personal-finance space.
3. On a tactical note, typically authors find an agent, who then finds the publishers. If you really want to publish a book, go find agents who have written books similar to yours and send them a pitch letter.
4. Also on a tactical note, driving 20k uniques in 2 months is very good. However, from looking at your site, you haven't captured those people. In other words, they came once and left, never to return. Think carefully about how to capture these people so you can continue sending them material that they want, love, and expect.
I can get into outbound marketing if people care, but suffice it to say that many, many startups overvalue social media and ignore channels that actually convert. Hint: Twitter. (Test it and see for yourself.)
4. MOST IMPORTANT. What is your goal? You indicated you don't care about the ego boost of being an author. So carefully consider whether a book is really what you want to do. There are many, many other channels (ebook, blog, etc) that don't require the back-breaking work of writing a book. Mine took 2 years to complete. A book is specifically useful for building your brand and spreading your ideas. But in most cases, there are other channels that work better.
(Incidentally, we should come up with a name for areas where people who work tell others NOT to do it. Examples: Authors, musicians, lawyers...)
Hope that helps. Let me know if you have other questions.