Not experienced at all but I have been reading up on incubating carpet python eggs to respond to this topic.
So far I have picked up that the temperatures should be between 88 and 90 degrees, which yours is only slightly short of. Secondly, how did you have the eggs in the vermiculite and was there enough air flow in there for the snakes to breathe through their shells?
Did the eggs get rotated at all? That can be dangerous.
Again, no experience, just asking questions which may help someone who is more experienced figure out what happened.
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