I ended up on Readwise Reader after trying a few different options. It unapologetically caters to power users and is clearly built by people who actually use and care about the product, so I'm finding it to be a pretty solid improvement over Pocket.

They also have put some effort into making their mobile app work reasonably well on eInk displays, so it's pretty great on a Boox tablet. It has real pagination, which is a feature that I was pretty annoyed about losing in Pocket when Pocket rewrote its mobile app.