Hacker News Reader

There's already a setting for that http://imgur.com/GftE0Wx

well, that's something but 1200px width is still way too long for optimal reading of lines at that font size.

it does look like it says MAX 1200...but i could be mistaken.

You're right. And that means the only way to set it to keep text contained less wide than that is to have a smaller browser window.