Personally, I'd have worked a little harder to persuade the "other 2" to take f/t, because as they grow larger & need larger prey, your pets run the risk of serious injuries & even death when they get chewed by the rats they're trying to kill. Wouldn't want to look forward to that, personally -scars may be natural on wild snakes, who have to kill their own food to survive, but it's best avoided on our beautiful pets for the sake not only of their beauty but their health. Rats CAN kill snakes, or injure them enough to make they wish they were dead: ask any exotic animal vet who has treated snakes for some time...they see eye losses, mouth injuries that prevent the snake from eating, and snakes chewed to the bone from live rats. Not all pets survive these injuries: either directly or because euthanasia is the best option, or they later die from the infections.Vet bills can be hard on your budget, & making time for medical care isn't the most fun either.
When snakes like BPs are raised on live feeders, they seem to get pretty good at making kills, but sooner or later, all it takes is a little slip up...rats are intelligent animals (they actually make great pets too) & they object to being dinner. They have serious teeth that can chew thru bricks & pipes...you really don't want them chewing through your pet, do you?
Many members here find a hairdryer (blow dryer) to be very helpful in warming the head of the f/t rodents so their BPs respond to them as if alive. I hope you'll consider this?