My line spacing with Kobo's own setting was so tight the words almost touched each other, and the Kobo line spacing slider wouldn't work with side loaded epubs. If I hadn't been able to find out about changing the setting in Calibre and reformatting the epub I might even have returned my Aura (I do have pin holes so I have cause for a refund) but reformatting the epubs now allows a standard decent line height and the slider now works.
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