How are you measuring temps? Infrared heat gun is your most accurate bet for hot spot temps. Check for mites, soaking too much could be a sign. Usually you will find some dead ones in the water bowl, and usually on the snakes belly. That being said, I have had bps that just randomly soak. Even though we know they aren't prolific speakers, it's not uncommon to see a healthy snake in the water bowl. Maybe try providing a humid hide too?