Hatching is a process, not an instantaneous event. The chick internal pips, external pips, and finally zips and pushes itself out into the world. It lays there wet and pitiful. But it soon gets up and plays rugby with the unhatched eggs and fluffs up. During this process it dries up the external blood vessels it no longer needs, absorbs the yolk, learns to breathe air instead of live in a liquid world, and who knows what else. This is tiring so it does occasionally rest. If you try to help it before it is ready, you can cause harm. Patience really is your best friend during hatch, hard as that can be. And not all make it on their own. The hard part for me is to know when to intervene. I don't always get that part right.
Some chicks do a lot of the stuff they need to do between internal pip and external pip. These usually zip pretty soon after external pip. Some do a lot between external pip and zip. I have not seen any take this long myself, but some people have reported as much as 24 hours between pip and zip. Those are nerve-wracking.
It sounds like the membrane may have been a little dry on the first one, though that may just have been that you maybe should have waited. I'm not there looking at them so I can only guess by what you post. I also don't know what the humidity is in the incubator. If the humidity is low, you might want to increase it. I don't know which incubator you have or how it is set up, but you raise humidity by increasing water surface area. If others have pipped it is usually best to not open the incubator to add sponges or wet paper towels. If you have empty water reservoirs in your incubator, you can maybe use a straw through a vent hole and a syringe to add water. Use warm water, around 100 degrees F. Incubators don't shed heat real well. If you add hot water, you can get a temperature spike, which is not good. If you add cold water, the temperature may temporarily drop but the heater should bring the temperature back up pretty quickly. That temperature drop is not all that bad a thing. Heat is more of an enemy than cool. But warm water will evaporate faster and bring the humidity up quicker. My humidity usually goes up by 10% to 15% when the ahtch starts, so this may not be a problem for you. But just something to consider. To me, 60% is kinda low.
