I use coconut mould (you can purchase it in bricks to be put into water at pet shops) as a substrate,only moderatedly moist.In no way should water drip when you take a pinch of substrate between your fingers.Moreover,I have noticed females tend to lay in the drier parts of the substrate,i.e. almost dry.
I place the eggs on that substrate,half-buried,in a plastic cricket box.This box is put inside the viv,at the precise place the female has laid her clutch.I do believe their instinct drive them to lay eggs at the best place as regards moisture and temps for successful development.
I don't use a hygrometer,relying more on how the substrate looks like:when it needs to be re-moistened,about every month,I use a 2 ml plastic syringe to wet the substrate a little,of course never on the eggs themselves.Hygrometers can be a source of confusion sometimes,you won't find any in my vivs.
Thus there is a night drop in the temps,which gives off healthier hatchlings.I have 100% success as regards egg hatching with this method,and I only lost one juvenile after a few days out of about 20 this year.
When I used vermiculite,constant temps in a more classical incubator,I only had 30% success.I think you should try my way
