Use the Better Hyphenation dictionares from this site, i was having the same problems, i use epub only and i like my paragraphs to look even, and the lines with normal spancing in beetween words.
i am still new to kobo and i didnt know how to fix those ugly big spaces from one word to other lol and @JSWolf helped me out making a spanish hyphenation dictionary and now my Epub books look beautiful! idk about kepub, because i dont like that format because i dont get static/real page numbers lol
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