What about the Remarkable (https://remarkable.com/)? It's both got a larger screen and it's supposed to have a vastly improved refresh rate. I haven't tried it, but I'm really really curious about it.
http://remarkablewiki.com/tech/specs
I use the remarkable for taking notes on online courses, and works wonders.
Seems I was wrong! I still maintain its very poor for reading papers I've found on my phone and then syncing the annotations.
Sweet, this is my second stupidest comment on this website.