As you noticed that my patience helped, however since you have already started helping the chick, its very important to keep the membrane moist.
I would say at this point run a shower in the bathroom to create a humid environment.
Wet a wash cloth in hot water and then squeeze it out.
Take the egg out of the bator and wrap it in the washcloth and go sit in the bathroom.
Open the wash cloth and start removing the egg shell chip by chip with a blunt tweezer.
Do not remove the membrane if its glued to the head and the back.
The object is to make the membrane wet enough that it will fall off on its own. If there is not one already, make a hole in the membrane for the chick to breathe.
Once the top portion of the egg shell is gone, the chick should be able to do the rest.
Warm up the wash cloth again if necessary and place the chick back in the bator all but its head wrapped in the damp wash cloth.
Its up to the chick from there on.
Thanks Juni. That's essentially what I did, minus the shower. I worked on the shell over the course of several hours. I'm so annoyed that I let this happen; I assumed that clear membrane = not dry. :/
Hopefully now it softens enough for the chick to get out. I don't mind waiting for a chick to do things on its own, but this one had just its beak out and was seeming to fade.