kindle eBook: readability issues on eink devices

[schwebke]

The kindle version of the book is hard to read on a physical kindle eink device due to lack of contrast.
The bulk text of the book is dark grey instead of a saturated black.

I can reproduce the effect using the kindle web reader as well.
See below for a screenshot from an ebook rendering well on the top,
and from Vol I setup chapter on the bottom.

The text's color renders as #333332 instead of #000000.
Nice on desktop display, but weird on eink reader.