For snakes like BPs or large boas that need more warmth, I agree, I'd prefer to heat about a third of the floor too. And also depending on room or home temperatures & local climate. As long as they have at least 1/3 of the floor that's off the heat just for safety.
@ nvmycj- You see, we (Malum Argenteum & I) both have lots of years experience keeping many snakes, & often it still helps to discuss the best methods & answers to problems, because each situation is a little different. Plus it's harder online, since we're not seeing what might otherwise be obvious in person. I'm sure glad nothing worse happened too- safety is the most important thing. Keeping reptiles isn't as simple or obvious as some pet stores make it sound- I think they don't want to scare off sales by making it sound too complex.
Ideally, it's better to completely set-up & test run an enclosure for a week or more with no occupants, & adjust the temperatures when you won't be affecting a resident. Since yours just ate, it's super important that he not be too cool (for digestion) now.