Could you consider increasing the font size on the blog posts?
You chose a rather small size (13px) and combined it with a rather wide paragraph width (940px). Those two combined decreases the readability a lot. I usually zoom in to read it. It works, but zooming makes the paragraph fill my entire screen, and reading paragraphs the width of the entire screen is not really optimal as well.
I tried to change the size to 16px / 1.6em line-height, and it both looks good and is way more readable.
Otherwise keep up the good job…