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This is most likely due to the margins being specified in 'em's. The unit 'em' is based on the current font size - 1em being the current font size; 0.5em being 50% the current font size; 2em being 200% the current font size, etc. So increasing the font size will increase the margins.
Assuming you are using windows, you should be able to fix this manually by renaming the file to .zip (ie. rename "book.epub" to "book.zip"). You should then be able to open the zip file and see it's contents. You will then need to find everywhere margins are specified and change them to something suitable - eg. 5px. If you are lucky they used a single shared CSS file and you only need to change it in that one place. But anyone who specified margins in 'em's is probably no expert so they could be declared anywhere in the epub's xhtml or css files.
Not sure how non-techie you are, so if those instructions give you problems just let us know where you run into problems and we can try to help you out.
Troy
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