Just in case this is a form of 'flash blindness' try reading while wearing a pair of lightly tinted polaroid sunglasses. This may help a little.
Try colouring a red centimetre square on some white paper. Have another sheet of white paper handy. Then stare at the square for approx 30 seconds. Quickly switch your gaze to the other white sheet. Unless you're colour blind, you'll see a green square which will gradually fade. This is the same sort of thing which happens when a page-turn flash flashes a negative image at your retina then you look at another eink page: you see the font as darker, but the effect wears off.
I would suggest setting your page turns to refresh less often and wearing polaroid glasses which may help with the glare.
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