Nice! I like blogstack! There's still couple of css nits I have with it - too much spacing everywhere (e.g. in ul>li lists), links are not linkified, there are scrollbar borders in random spots.

Just for inspiration I recommend checking out lesswrong: (e.g. https://www.lesswrong.com/posts/895quRDaK6gR2rM82/diseased-thinking-dissolving-questions-about-disease ). They have really fine tuned their reading experience...