I'd really say not to worry about it. Mine as an adult spends about 95% of his time in his cool hide, but I know he's using the warm since that's where he usually leaves the feces and urates. Plus I can tell due to the bulldozed plants. Plus he's digesting and eliminating, so whatever he's doing is working for him.
TBH I'd be worried if he used it more, probably would mean his cool side was too cold for comfort.
Think what he normally does is use the hot hide as needed after I go to sleep around 2AM (sometimes he'll just bask on top of it closer to the CHE than UTH), while preferring to sleep in his cool hide.
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