You should check out the Serif readability myth:

http://asserttrue.blogspot.com/2013/01/the-serif-readability...

Personally, I don't really like that text is so big compared to the body width. I'd say you are getting a word-per-line average of 10 or so, way too low in my opinion.

I don't think there's much actual science behind the purported aesthetic properties of the golden ratio.

Thanks so much for your feedback, guys! I'll drop it down a little.

Perhaps just slightly too large, but I do like your typography ;)