I heard bad things about the Onyx A2 refresh mode, but I'm not sure if I've got that right. Someone said it wasn't as good as the Nook ST A2 mode, but I could be wrong about that. I browse very well on a Nook ST with A2 mode (but you have to frig it. It's not for everyone). As I said, you can install A2 on a Sony T1/2 that is supposed to work very well. Personally I turn images off.
Sadly the e-ink monitor is not out there yet (unless you get a Dasung). All I can suggest is you avoid using LCD whenever possible. Get out more. Your eyes are telling you to reduce use of screens. I avoid using LCD for fun. It's for work only (almost). Go for a walk or buy a paperback