Chiming in a bit late....

I agree with Ed, moisten the substrate and make it deeper.
Some of my females will stop nesting if they hit a hard surface before the hole is almost as deep as their shell length... seen it many, many times. My substrate is at least 6 inches anywhere they have or are likely to dig nests in. I am currently using a blend of oystershell and coconut coir.

Pretty exciting stuff, huh? Good luck with the nesting!

Your animals look great too!

Hope the sniffles stay away. I have been told that they sometimes get the sniffles if the cage is TOO dry.
I always give my kleins moistened areas they can retreat to IF they choose to.

Bill S
NeTxUsa