Austin, I've seen more than one of our rescues that once they are in a healthy environment, eating good quality prey on a consistent basis, well they just seem to suck every bit of nutrient out of that prey that they can. They often seem to gain more off the same volume of prey than one of our well kept snakes. I'm not sure why, perhaps just nature's way of allowing them to catch up and finally grow appropriately after a long time of poor care and poor eats. Likely you'll see some quick shed cycles too as the snake puts on some weight and starts to grow again in both girth and length. We've had a few that came in well undersized for age and every one of them is now well into the normal range for their gender and age. They really are very resiliant creatures.