Welcome aboard!
I have a question. I have the exact same dimensions and very similar set-up/build as you described. I placed a digital thermometer inside that records the highest temp and lowest until I reset it. I reset it daily and generally I have a the between 10 to 15 degree difference in temperature from the day to night. How are you monitoring your temperatures? Are you sure that you are not already getting the difference?
Be careful with heating pads/cooling pads though. If you have water in the bottom of your terrarium then the cold and heat pads could potentially bust the bottom of the terrarium. I have water in the base of mine for a water feature so I opted not to use them as I could see the temperature change daily already.
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