It's odd that your first and most prominent screenshot has such bad typography:
regulation the circulation.
Bad typography is my main quibble with the Kindle app. It's been awful for years.Have you looked into a better flow algorithm, such as the Knuth/Plass [1] algorithm from TeX?
[1] http://onlinelibrary.wiley.com/doi/10.1002/spe.4380111102/ab...