Now obviously snakes in the wild don't follow charts, & some variation isn't going to hurt anything. For example, if you feed a slightly larger than usual meal, you might give a few extra days before the next meal, etc. A rat fuzzy is a bit small for him now, so if he's hungry, & you have more of this size to "use up", I'd feed him every 5 days- they should be digested pretty easily, & feeding smaller but closer together is less apt to cause a problem than trying to feed 2 of them together & causing trouble digesting for him. Snakes don't eat on schedules in the wild either- they eat when they find food, when they can.