I think there are ways of forcing a single type size in epub books, but I think most would consider them to be 'poor practice' - to be shunned by experienced ebook creators. Is this happening with all your USB-loaded epub books, or just some of them? Can you give a title that we can get ourselves for free (or cheap)? I just checked two epub files on my original Kobo upgraded to 1.8 (should be equivalent to wifi Kobo) and they change size just fine.
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