I believe the 653 upgraded to a Carta screen in 2015.
Shak3800 - I am not sure which reader App you are using on your Icarus, but some are better than others at allowing you to fine tune your font for a sharper, more solid look. My preferred App is Alreader, which gives a decent range of font tuning options. Also, on Android e-ink readers, I have found having a frequent refresh rate helps.
As Dopedangel suggests, try some other fonts too. I like the Charis Modified available on this site.
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