Am I right assuming that they hatched late as well?
One thing you can do is build a box around the incubator at a distance that will help hold heat in but still allow transpiration of oxygen. Is the light on all the time?
That is exciting to become famous in the local chicken world.
As soon as you pull them from the hatcher. Otherwise you may never tell them apart.
There are many home built incubators in the learning center tab above.
