30 is too low. you want to bump that up to about 33.

Can we get some specs on the set up?

What are you using for heating, what type of enclosure are you using, are you using a thermostat, what type of thermometers are you using? All the details please.

And dont use cage carpet. Use paper towels. Thats what I use in my rack and a lot of other people on here use. They are awesome.