Have you tried running the file through Calibre? It can often be set to make the correct
compensations for the way your reader responds to the file. (Try setting the output
profile Page Setup to "JetBook 5-inch")
The nature of PDF can cause problems in itself. Some PDF files are little more than an
image of the page. Some have been constructed to allow for PDF-Reflow. PDF ebooks
can be formatted to match the display and page size of a particular device, and look
great as a result, but only with the font size at a particular setting and/or where reflow
is disabled.
Luck;
Ken
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