I am deeply sorry for your loss. Noel was a joy to know, even on a through-the-web basis.
Perhaps you might consider a necropsy to try and find some answers. As Damian said, with such a high known mortality rate among CB neonates, it's very likely you did everything right and there was a congenital defect or perhaps just a malnutrition problem. Some species don't produce very nutritious egg yolks or sacs in captivity and the babies "starve" through no fault of your own. A necropsy might give you some peace of mind if you find out the reason.
My thoughts are with you. I sincerely hope your fond memories of Noel will carry you through your grief.
The Zombie Mama is here!