Two things to try are:I am having this problem with my black Langshans from my new trio. It is discouraging. The Pita Pintas and PP mixes just pop right out with hardly ever a problem. The Langshans on the other hand are sticky and have a hard time hatching. I'm going to concentrate on the nutrition that my trio is getting to see if that makes a difference. The Langshans from our field flock hatch as well as the PPs do. I've now completed about 4 hatches with the trio's eggs and even when I started them a day before the other eggs, they were still the last to hatch and were sticky. They are strong chicks once hatched but I'm sure the stress of their hatching has shortened my life!
Misting
Cool down
Do both from day 8 to 14