One quick and easy thing to try is to use Calibre and - convert the epub to LRF, then delete the original epub (keep a copy!). Reconvert the LRF back to epub... this may help.
Otherwise, use Sigil - I've changed a couple of Amazon ebooks which were a bit too small in epub on my 350 (and then too big in the next font step up due to the absurd Sony font size steps).
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