I'd keep the "warm end" of the cage at or below 90*. Not only for safety, but the warmer he is, the faster his metabolism is working & the more weight he'll lose.
"I feed him F/t. Not sure of the temperature, have just been doing what I have always done, slowly defrosting it in a double bag in water and then putting it in hotter water right before feeding time. I am asking for one of those fancy schmancy laser thermometers for christmas, but I have not changed anything in my thaw process."
F/t cools off pretty fast, & many here thaw in similar ways but blast (especially the head/nose of the rodent) with a blow-dryer right before offering, & it seems
to work for most people. BPs rely a great deal on their heat sensing pits to identify their prey, & rodents have a high metabolism (meaning they're quite warm
when alive)...you want to replicate this as much as possible.
And as always, handling is risky with a snake that's not eating, especially one like yours that's obviously not relaxed about it yet, & may never be. Any stress is likely to make him less willing to eat. (Unless of course he's just still full from eating larger rats???)