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@JSWolf,
A bit of background info re font-sizing, Kobo vs. Sony. Firstly they don't work quite the same, luckily that won't usually matter.
Kobos don't have a default font-size. Kobo font-sizing works very much like its line-height, i.e. when you set the font-size with the slider bar it's the same as adding body {font-size: xx} to your css, where xx is one of 24 values in the range 12-58. The units are not ems, probably they're points. The reason that it probably won't matter is because, if all your other css font-size settings are set in ems or %s (as I'm guessing yours are) then all elements below body will scale as expected. So anywhere, below body, where you've coded font-size:1em just multiplies xx by 1.
I don't think you would have quite the same objections to Kobo font-sizes as you have to their line-heights because 12 is really tiny and 58 is whopper. Nevertheless, be aware that there are gaps in the 12-58 range and the size that you prefer for one font won't necessarily be the size you prefer for another. If all else fails you can still re-tweak your Charis font till it's perfect for you.
On the Sonys, as far as I can tell, changing the font-size is more akin to applying a scaling factor to the epub's body font-size.
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