1) I would fix his temperatures anyway as it helps them digest. If it's too cold the feeder will start rotting inside your snake instead of being digested.

2) How hot are the f/t feeders? I make mine quite warm on the outside - the water is 105*F or so - as otherwise I've found that the snake sometimes ignores it in favor of my hand. With a BP that's not a big deal, with a boa it's a huge bloody deal...