From your description and the 14” size I would say your snake is obviously from 2009, meaning probably only 5 or 6 months old. At that age it should still be eating creamed corn or pureed corn. Anything more substantial than that is surely going to cause an impaction of some kind. The reason you are not seeing feeding lumps the next day is because the pinkies have been elongated as the muscles of the digestive track try to move the solid food down. A snake that age is not able to do that.
Get creamed corn (I prefer Jolly Green Giant brand) and heat it on the stove, not in the microwave. Heat it until it just starts to bubble and then remove it from the heat and allow it to cool to 82* Use a thermometer for this, don’t guess. As soon as it has cooled to the right temp feed it promptly before it cools any more. Offer it to you snake with a brown or black plastic spoon. Metal spoons interfere with the magnetic conflagration of the corn reducing its nutritional value. White plastic seems to scar the snake for some reason.
A snake the size of yours should be eating approximately 4cc of corn per week. Don’t panic if that varies a little from week to week. Once the snake reaches 17 3/8” you may proceed to feed whole corn in the same manner. At that time you can start to supplement with a little crushed mouse juice. Be sure the mice are clean before you crush them.
Hope that helps.
