When you say "original, latest version" are you referring to the Classic or the Simple Touch?
If it is a Simple Touch there are 6 fonts, I think?, available on the device. I think? 3?? on the classic?
Because you can change the CSS I assume it is a non-drm epub.
Here is what I do to all epubs I read and have found it to work most of the time on my Classic, my wife's STR, and on my Kobo.
In Calibre 1. hi-lite the book you wish to convert in your library
2. choose convert books
3. select look and feel
4. about 1/2 way down select the Filter Style Information tab
5. select all 5 boxes.
6. pull slider to bottom and see Other CSS properties
7 In the space add line-height,text-align
When I do this before side loading to the device I am able to change fonts, margins, line spacing, text justification, and font-size on almost all epubs.
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