Absolutely not! 85*F is the max safe ambient that a BRB can tolerate before experiencing neurological issues. Many people read that and keep their cool spots too low - 80-82*F - as a result, and then they end up with snakes that get sick or regurge because they can't digest. Mine run at ambient in the mid 70's with a basking spot of 85-87. The max safe ambient is something you need to keep in mind in case you have a power outage or air conditioner failure in the summer, you will need a way to keep your snake cool.
Spaghnum moss is fine for humidity, I just prefer cypress mulch.
Yawning/resetting the jaw after eating is normal behavior for most snakes.