Help: bps not cutting the sac

Hello all, I have a clutch of 7 eggs that I incubated @88 degrees and on day 58 I cut small V-flaps. Then on day 59 my first nose came out, and all the way out on day 60, also another nose out day 60 and then came all the way out on day 61. So then I cut the remaining 5 eggs into circular openings since the first 2 had come out, very careful to not knick any veins. The remaining 5 still have not even cut the sac to stick their nose out, can they be this far behind the first 2?? They are also turning a suspicious pink color, but I do see that they are moving/breathing. Today is day 63. Advice please?

Cut the sac. We haf one die inside the egg because it didnt cut the sac. I think it is safe enough to cut this late in incubation.

I would cut.

Personally I would leave them be. I just had a clutch of 8 eggs hatch. The first came out on day 59, and the last was day 70 or 71 and still had the yolk sack attached. They were incubated at 89 degrees.