BPs, especially males, seem to prefer their cold side and will only peek into the hot if the cool hide is too cold or they need to digest/shed.
Mine spends 90% of his time in his cool hide at 80F and rarely enters the other one. Know he does since he's fine, but.
Only time he was spending more time in the hot was when his overall ambient was a little too low for his tastes. Got it where he likes it now.