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Another thing to keep in mind, is apart from Images, Fonts files embedded within the epub will usually take a huge amount of space, wether they are used or not. If you want to try, grab Sigil and open each of your epub's and check the font folder. If you don't mind the epub being displayed in the kobo's native fonts (and it may be doing that anyway, depending on how the epub was created), remove the font files and chances are the epub will dimish greatly in size.
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