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Never had any problems reading on a backlit device. How bright the screen is differs from device to device. I read on zero on mine. 20% can be too much, depending on the surrounding light. Additionally many reading apps allow to set the brightness in the app. Maybe it is brighter than you think.
Other than that, some people have the troubles you describe (but your symptoms are quite extrem). Maybe try an e-ink device, if you mainly read novels. Dpi is not that important (in my opinion) in contrast to your problems. A kindle or kobo has quite acceptable dpi. They are also lighter and batteries last at least a month.
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