Here's my solution...
I use a mac for a desktop - so I use a tool called "skim" to crop my pdfs...
I use this to crop the excess white border around a PDF. I specifically crop them to have an aspect ratio of 3 x 4 (same aspect ratio as the aura hd). This is important so that I can always zoom into a pdf using the zoom button, then set the zoom to the width of the document. The PDF will zoom in to show the entire screen, even lopping off the "Page xxx of xxx" on the bottom of the screen. You wind up with zoomed in, full screen PDF content (usually 108%).
It works great on all those 9x7 pdf technical books....
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