One thing I have done (and I am no expert)...chip the shell away about a third to half. If the inner membrane still has blood vessels, use a warm damp paper towel to wrap the egg (at least the exposed part) leaving an air hole where the beak is. Every hour or two remove the paper towel to see if the veins are gone...if not, rewrap. Keep doing this until the veins go away, at which point you can open that end of the membrane. I don't help the chick beyond that, though. I feel they need to come out on their own, as they may just still be absorbing yolk. (I did this with 2 bantams a few days ago when they hit day 23+ and had pip'd over a day before...2 had hatched the prior day and 2 died prior to PIP...and the 2 I helped had really dry membranes. I felt like they were shrink wrapping and not going to make it on their own)
Do this at your own risk though, ok? Only what you're comfortable with...and you still have the issue of the other chicks pecking at it.