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I only have a very few images that are not intended to be full width. The exceptions are my publisher colophon and, in the case of one book, a hand-drawn sunburst that breaks the book into sections of varying length. So in those cases only, I size the uploaded image so that it cannot expand to unreasonable size in a KF7 device. In the case of the colophon, that's 100 pixels square. I don't remember the size of the sunburst, but it was smaller.
That being the case, I've never had occasion to use media queries (or tables or any such workaround).
It's nice of Amazon to support ten-year-old devices, but their users should not be surprised that they don't render books as nicely as current Kindles or Fire tablets.
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