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You may not like the answer, but I too have a requirement to read and annotate a great many academic PDFs, and a tablet is a far, far better choice for this task than an eInk device. Efficient PDF processing requires a lot of RAM and a fast CPU; eInk devices generally have no much RAM and slow CPUs (to save power).
Over the years I've reached the conclusion that the ideal device for PDF work is an iPad and the "GoodReader" app.
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