I've found that as a rule the smaller the egg, the less likely it is to survive cutting. I'm not sure why, but I believe that with ball pythons the eggs are fairly large and so are the hatchlings so cutting into a vein and losing a few drops of blood is no big deal, however cutting into a smaller egg with a smaller hatchlings, losing a few drops of blood can be a pretty big deal. I'm not sure that's the reason, but in my experience cutting smaller eggs the hatchlings are less likely to survive.
BTW, hatchling fire skinks would be pretty cool to see, do you have any pictures yet?
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