I'm not a fan of hovabators, but if that's what you have to work with I recomend using a Helix thermostat along with it to help with flucuating temps.
When I incubate my rhino eggs in vermiculite I mix 1 part vermiculite to 1.25 parts water by weight.
Temperature at 86 degrees.
Eggs covered in shoe box size container with paper towel under lid to make sure condenseation doesn't drip on your eggs.
I hope some of this helps. If you go to herpnut.com click on articles and scroll way down to incubation of eggs it might tell you a little more.

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