For those itnerested, if you are using calibre to convert books, you can try the following: Covnvert to Epub, Click "Look & Feel" Catagory from the left hand column, Click on Styling Tab, Scroll down a bit, and you should see a text box labeled "Enter Other CSS Properties" Type in "line-height" (without the quotes.) Convert to epub as you normally would.
That should remove any hard coded line-height, and the kobo sliders will work as advertised. I might think that would make a sensible default option for kobo users, but I haven't really tested all that much across a wide range of books/devices.
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