I think the problem is more likely the constant jostling and checking on the snakes while they're in the egg that causes the problem. They tend to try to hide further in the egg when that happens and it increases the chance of getting tangled.

I cut my eggs, but my egg boxes are transparent and my incubator has windows, so I don't even have to take my egg box out to check on them. I just walk up to the incubator and peek in. I open the box once a day to get some fresh air in the tubs but that's pretty much it. I understand the urge to check on them all the time, but they are much more interesting to look at once they come out of the egg anyway!