Here are links to a couple of excellent pdf files that I stumbled upon on the University of California's website. I figured somebody might be interested in them. They have some very good information dealing with incubation problems and candling/breakout analysis.
Enjoy, Ed
Egg Candling and Breakout Analysis
Common Incubation Problems: Causes and Remedies
Enjoy, Ed
Egg Candling and Breakout Analysis
Common Incubation Problems: Causes and Remedies