Zach...here's something I found quickly on-line.
http://animalscience.ucdavis.edu/Avian/pfs33.htm
(Scroll down to the blue section)

Most of the info I've seen suggest...nutrition (as well as all the other items we have identified..such as moisture, etc)...To be just as likely a cause for the types of problems we see.

Oh yeah, the book in which the study was done in regards to fat content and hatch failure was...
Vertebrates (second edition) Kenneth V. Kardong

I'm searching for that section but....at 760 pages...might take me a minute.

Cheers,
D.