I would cut on day 55 at that temp. eggs under that pressure, with no dimpling means no air pocket inside that egg. yes they can and usually will pip by themselves. but why risk it, day 55 they are full termed, I just cut one egg that was like that and I couldn't even pinch it. when I made the cut a lot of fluid came out, which is what I wanted. you don't have to make a big opening in the egg. just so you know that there's a slight air pocket and the hatchling can get out safely. good luck don
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