Maternal incubation can only be successful if husbandry temps and humidity are optimal, if they are not it will fail, this is why most people chose to incubate their eggs as it is easier to control the environment in an incubator, especially with several clutches.
If you want to maternally incubate my first suggestion would be to switch to cypress mulch which will hold humidity better than what you are using without molding.
Good luck.
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