I realize this is an old thread, but I just mention that I'm one of those who don't care about hyphenation at all. I've disabled it in the epubs I load on my Nook and Kobo. And the text is always justified, as I can't stand the ragged right either. I don't use the justification option on my devices, because that messes up the images and sometimes even the headlines. The justification is inserted in the css.
As to using kfx on a Kindle, no way. Aside from the hyphenation issue, the kfx format wouldn't work with the FONT_RAMP hack (custom font sizes), which is indispensable to me.
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