I really don't see it as realistic for one document / ebook to produce the exact same results on all screens. Even trying to index the display for a screen type would become a Babelian task, since new display proportions are generated on a regular basis and users can alter the font at will.
E.g. if I'm reading Shakespeare on a smartphone, and I prefer to use a larger font size, I'm pretty much SOL no matter how it's formatted.
Some ebooks aren't formatted well, but on the other hand I've seen quite a few books with good formatting. IMO it has less to do with the tools than the expertise you bring to the task -- as well as holding realistic expectations given the diversity of display options.. Not that the current formats are stupendous, but I expect that once you get used to some of the quirks you'll gain more control over the process.
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