What I was trying to say is that Sonys and Kobos have other ways of applying Extra CSS than by doing a calibre conversion. Both Sonys and Kobos can store an Extra CSS file on the device itself. Although the method of getting it applied to each epub (or kepub) does vary by brand/device. The Extra CSS may be font-related but other types of CSS can also work effectively. Given the nature of CSS specificity I wouldn't claim that all CSS problems can be fixed this way, but a little creativity can go a long way. If you've tried them all and it doesn't work for you, fair enough. I just wanted to make sure you knew that other potential options exist.
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