I don't think the insulation should effect your humidity. Usually its the ambient humidity of the room that dictates what your humidity levels in the tank are going to be.
If you're using a heat lamp this will suck up a lot of the humidity in the tank. You could stop using it and modify the set up to work with just a UTH alone.
If you're not using a lamp there are a few things you can do.
A. Mist the tank routinely to maintain humidity. Just be careful to not mist too much to the point where you have damp substrate.
B. Creating a humid hide in the tank for the snake to search out when he needs. Most people use moss in a plastic tupperware with a hole cut into the top of the lid.
C. Use a humidifier in the area the tank is in in an attempt to bring the over humidity up in that area of the room.
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