in my experience it is best to fit the text you want to read into the left/right viewable are of the DX which is a little less than 5.5". Kindles will automatically try to scale a pdf into the viewable left/right area, but if things are outdented (like some header/footers) or other formatted outdents, then you may end up with unwanted left/right blank margins (and font sizes squeezed down to accommodate same). If you have complete control, then set font size to something you are comfortable reading and then ensure that everything is laid out in 5.5" width with as close to 0" you can get for the left margin. Vertical page size matters less as kindle will attempt to flow/fill pages continuously.
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