I use straight Perlite, slightly moistened and don't use the substrateless method. I probably do 2 to 3 inches of substrate in the egg box, but it really all depends on how the eggs are stacked on each other (I tend NOT to separate them, because I'm to worried I might tear one).
I used Hatchrite my first year, so I was familiar with how moist was moist enough. Always default to not moist enough, you can always add more moisture, but it's hard to take away. If the eggs start to dimple a little, I just add a teaspoon of water to each corner of the eggbox.
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