What kind of food are you feeding him? There is a great article here on EBN that lists the various foods available commercially, and then rates them on a scale of 1-6. More than likely the food is the culprit for the poop eating problem and the fact that he is hungry all the time. He may not be getting the best nutrition his growing body needs.
I know that Fromm's Beef Frittata is the #1 recommended commercial food here at EBN, but we feed our Winston the Blue Buffalo Wilderness that is grain-free.
The true #1 food recommended here is RAW feeding! I haven't tackled that one yet, but it has my interest. Please read through this article, and see where his food falls on the charts.