On the Look & Feel page: "Disable font rescaling" and then add your own styling.
I use Tweak ePub to replace the calibre generated stylesheet.css with my own standard version but you could probably use the CSS box on the Look & Feel page.
For paragraphs I use: P { font-family:sans-serif; font-size:0.79167em; text-indent:1.5em; margin:0 }
This gives a small but readable size on Sony PRS-300 reader which scales well to Medium and Large. I also add styles for H1, H2, etc.
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