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The page template file is an old Adobe extension that dates back to before ePub was standardised. It allows a few tricks on ADE-equipped readers (such as very limited conditional styling, slightly better support for columns, etc), but was never well supported or developed past its first incarnation. For some reason there are a few ill-informed technicians who still think they should include it in their ePubs, though they only use it to set page margins (and do so very poorly). The best thing to do is simply to delete it (I don't think you even need to strip the DRM first).
But clearly there's something else going on here. 17MB is massive for an ePub and suggests that there's an incredible amount of padding that the reader is having to sort through.
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