I have found that PDF'S I created for my KDX using ISO A5 as the page size (perfect for the KDX) were not too bad on the KF. Although as the OP stated, it's best to create PDF'S with a page size equal to the physical screen size and with as little margin as you can get away with.
Since PDF'S on the KF have a very nice pinch to zoom capability, the margin requirement is not as necessary as it used to be.
Reading PDF'S on the KF is better than I thought it would be.
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