Hey, thanks for checking back. 20 - 30 is really too low. You might find she has trouble shedding with those percentages. Try the alluminum foil on top of the screen. Tape it in place, but outside the tank. You never want to use tape on the inside of a tank. Snakes in general have a habit of snagging themsleves on it.

If you don't have that available a damp towel over the top of the screen works wonders temporarily.

With the foil, you should be able to mist once, or twice daily and hold a pretty steady 55%. Just figurure out what works well for your 10gallon. If it shoots too high, peel back a little of the foil. You can also cut out areas for your heat lamps ect.