Although there seem to be some eBooks formatted similarly to how I did there such as
http://www.amazon.com/Thinking-Tree-...s=hecate+scifi
However, since I see no real downside to formatting like you suggested, it's done now. I actually like it better myself too.
It seems like it might take 12-24 hours or so before the updated version goes live though. There should be enough time for that before the promotion ends.