Hi Robert,
I changed two things (I used the exact same boxes as last year). First, I made an acrylic piece to place in the distal end of the chamber to lower the roof in nest area (to make a tighter space for egg laying). Also, I changed the interface between the humidity reservoir on the bottom and the laying medium above. Specifically, I placed plastic egg-crate on top of the perlite and also used a plastic mesh over the landscape fabric at the interface. That prevents any wicking of moisture into the egg-laying medium and keeps the animals from digging through the landscape fabric.
If you don't remember the basic design of the boxes, the previous paragraph will mean absolutely nothing to you 
. Let me know if I can provide any more specifics.
The system provides a couple of important things. It allows the female to do what is hard-wired into her--dig a nest. Also, with the humidity reservoir underneath, I can keep the moisture in the laying medium slight, but the humidity high (the humidity reservoir hold about 1.5 gals of water in each chamber). A side benefit is that it also creates a large thermal mass to keep temps stable. Also, it's all in a small, manageable space.
Here are a couple of questions to consider when thinking of how to provide for oviposition: If the female doesn’t have an appropriate environment for egg laying, will she hold eggs longer than she normally would, resulting in low egg viability? Does the physical act of digging a nest facilitate oviposition in some way? I think it is very reasonable to assume the answer to the first question is yes. I don’t know the answer to the second question, but it may be reasonable to speculate that it does. Either way, both of those ideas are addressed, at least to some degree, in the egg-laying boxes I’m using.
After I am confident that no more refinements would be helpful, I will try to simplify the execution of the design, so it will be easier for others to implement. Even at this point, a mess-load of eggs in the incubator with an insanely high viability rate shows that I am real close.
If it will help, I've attached a photo from last year showing the whole box.
Mark
www.DrSeward.com
