Because a snake is capable of taking a larger prey does not mean it needs to to thrive, grow and be healthy, overfeeding in captivity is an issue and increase of fatty live is too.
I have some 3500 and 4000 grams females and the biggest they get is a 150/175 grams rat weekly. They could take down a retire breeder rat which is usually around 300 grams however I am not interested in having a sluggish snake for days (considering the toll digestion takes)
In the long run smaller is better and personally I never feed something that leaves a bulge.