I am not sure if power feeding is being used correctly here. A power feed is a type of force feeding. As the snake is finishing a meal, you still the head of another it it's mouth and it has no choice but to start swallowing. This is highly frowned upon.
As far as I have seen, for babies and juvies, 3/4 days feeding schedule is fine until adulthood and then a standard of 7 days for healthy sized adults.
If you are dealing with an undersized adult, the 3/4 days will work also to get them back to a health weight before going to the 7 day.
I've said this in another thread recently. Personally, I have never seen an overweight BP. I see penty of underweight ones. BP's are not garbage disposals. They are not boas. They will only eat if they need to.