Personally, I would wait.
I hate cutting eggs open, unless you have one or two left unhatched, days after the rest of the eggs hatched out. If the eggs were too wet, and some of the babies suffocated in the eggs, then I think the dammage is already done, and assisting the hatchlings out may not help anything.
Since there is not a lot of breeding info regarding P. mearnsi, it is hard to say, weather your eggs are way overdue or not. Maybe someone who breeds thalissinus can offer some advice.

That is just my opinion, do what you feel is right.
Good luck.
Nick

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