Time for larger prey?

Up until now, I've been feeding my cinnamon fire and mahogany girls rat pups every four days. Last I weighed them, they were between 390 and 415 grams. My supplier tends to run large by the way, the pups range from 25 to 35ish grams. The weaned rats are... large. They're 40-50 grams, most are closest to 50, best I can tell. These snakes are amazingly strong feeders and have never missed a meal. Should I start offering rat weans once a week, or stick with the pups?

I'd be stepping up to weaned rats at that size. Once a week is fine, but you could stick to your 4 day schedule also until they're on small rats.