Either way works fine. I have no idea about the lump after 12-24 hours.. I feed my juvenile corn massive meals and the lump is gone after 3-4 days and 1-2 craps later. I could never wrap my head around feeding a specific size/amount. All things equal, some snakes metabolize faster than others and there are growth spurts to consider. If an animal is looking thinner than it should, it'll get larger meals or fed smaller meals more often. If one is looking thicker, it'll get smaller meals or skip a feeding here and there.