I read the book last week - thank you for writing it!
I really hope you reconsider your stance on the conversational tone, which made reading the book difficult at times. Being informal or conversational is not bad per se, but it leads to verbosity that obscures the content. Cutting out some of the current verbosity would make the book a lot clearer and easier to digest, and I think you can do this without sacrificing the friendliness and approachability of the book.