Hi!
Nothing wrong so far.
1) Your grey scale images show the typical dithering. In-between-grey-shades will be mixed with (depending on the used algorithm) regular or irregular patterns. Same on my PRS350.
2) What interest me is what you mean with 'jagged fonts'. I presume you are a very accurate person. What you see is probably the (in my opinion) bad screen-resolution of the 6-inch-readers. 600px * 800px isn't that good for six inches.
A.
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