i had a similar thing. one of my eggs was three or four days later to hatch, so put the little guy in with his siblings in the cardboard box i start out with in new hatchlings.. pecking started, so had to separate them, but only one heat lamp. so i grabbed a picture frame glass and slid it down...
I did come across this one book on genetics and the fowl. 600 pages of it. it may help a few on here. http://reader.library.cornell.edu/docviewer/digital?id=chla2837819#page/141/mode/1up