I may end up doing the same thing like you. My ran away to the far end corner when I open the coop door. I tried with cracked corn twice, but still no success.
Let us know how they turn out. I am curious myself. I done feather sex many times from 1-3 days old. Some of the breeds, the feather don't show up until 2nd day.
Here is my Dorking block (2 cockerel, 3 pullets). I purchased them from user Rockashelle. They hatched on 2/24/13 and 4 out of 5 are rose comb. I am working on size and shape first. The colored birds are much larger than the red.
4 colored and 1 red