Hi rehaber,
I gave you all the advice on my intervention thread-take a look.
You definitely need to intervene, and soon. Since you see a feather, start looking around that spot to start helping. Hopefully the nostrils are already free of a little membrane.
Take DULL tweezers and very carefully slowly pinch away some of the shell near the head area so you can see what you're dealing with. Work slow and just put the bottom side of tweezer right under the shell surface- don't include the membrane when you pinch down on shell piece. The reason you pinch shell pieces off is because of you pick or pull, you'll definitely end up yanking on membrane and cause bleeding.
One you remove some shell, look at my advice on the intervention thread.
And lower your temp from 102 degrees to 99 degrees even. Waterfowl are to be hatched at a slightly lower temp than incubation. And 102 will dry things way too fast.