I think jackie_w's first suggestion is the best approach: just remove existing instances of "text-align: justify".
Doing an epub-->epub conversion can cause other things like margin adjustment to stop working because of the way Calibre creates the new stylesheet.
And adding text-align: justify to every paragraph, such as with Calibre's Kobo driver extra css option, can mess up a lot of other things such as chapter headings (a lot of books use paragraphs for chapter headings, and they look very bad justified because of the large font size).
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