You could even be over feeding the critter. Too much food could lead to rich poop and the interest in eating constantly. I have am old glutton female and it is very hard to manage her intake in a cage with others. And the bigger she gets, probably the more diabetic she gets, so the more she eats to compensate. It is a spiraling effect that leads to glutton death.
He could also have failing organs which leads to malnourishment no matter how well he is fed. Most animals will seek nourishment anywhere they can get it when things are awry. Poop eating in general suggests some disorder somewhere.

If he is alone, I'll bet the problem is mental/behavioral. You would probably see a marked improvement in him with a cage buddy, preferably an older adult / rescue, or two, or three...
If he bit you with his poop teeth, you have just been tattooed with fecal bacteria and a barrage of other scary items. I recommend an immediate scouring, anti bacterial cleaning and antibac ointment. The human body can most always deal with this kind of thing, but all it takes is that one time that it cant. Ed can share his story with you on that matter...