Actually, I did some research on this that would indicate otherwise about a year ago after pulling all the articles from the API. Statistically, the best time to post for average score was Saturday Morning, around 8 GMT IIRC.

It made sense, too. As most analyses will show, fewer articles are posted on the weekend and therefore new turnover is pretty low.

(Just pulled the numbers again. The average jumps up 4 points at 11 GMT on Saturday and stays there until 3 GMT on Monday morning)