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I did more testing, if the hinting is done for the single purpose of rendering small sizes, it usually ends up with bad results on eink, while eink renders general hinting for pixel alignment much better. It probably does some sort of conversation for its weird pixels. Therefore, bad hinting (which might not be evident in LCD screens but mucks up the conversation, I think) or hinting specifically for small sizes render badly.
There is a simple test to see which one your fonts have: if the font file you use greatly changes the shapes of the rendered glyphs in different sizes, you might be better of removing the hints. If the shape changes but difference isn't that great (you will understand what I mean when you see it) you might want keep it but hinting doesn't create much of a difference in eink.
Also, if the type seems unusually thin compared to LCD rendering, remove the hintings.
Font files prepared for web (which is much different than web enabled font files) are usually works well with eInk, but font files for printing are usually are not.
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