Yeah, I spent a few hours fiddling with numbers. For the most part, if you want any significant amount of extra text on the screen you really have to shrink the footer ( < 20px ) because odds are your font size will be large enough that you actually need quite a of space for more than an extra line or two. It's still noticable, though, and I quite like the slightly smaller bottom footer. Here's how it looks on a .kepub sent from Calibre using jgougen's driver with my above settings:
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