Weird Brooks Kingsnake Poop?

[Kytero]

I was told he was 2 years old when I got him a year ago, he had always been very confused on how to eat if he didn't grab the head, he had always been like that but always ended up eating either way. His temps are 88 warm side and 75 coolside, the heat is regulated by under belly heat tape in a rack system with a herpstat. He looks healthy, I have checked his mouth, nose, eyes and rest of his body for any signs or illness (scale rot, RI, etc) but have found nothing. He has sneezed once in my care but that was during a shed. I feed him a small rat once every 10-14 days, but in the last feeding, I thawed out one that was a little too big, I'm wondering if that could possibly be the cause of him spitting it back out? After helping him feed for months, he finally learned how to strike and eat the rodent without letting go and forgetting it was there. I'm thinking it could have been a habit he picked up from the breeder who had him before me. Either way, he doesnt have problems eating anymore besides not wanting to eat during this shed. As for pictures of him, I only have one at the moment but I can get some more later. He was a bit of a chunky monkey before so I changed his every 10 day feeding to 14 days and that seemed to do him well. Vet wise, I can't do anything with them. Before I ever got into the snake buisness I made sure there was a vet who knew about reptiles in my area. However, after actually bringing one reptile to the vet because of a small cut, the vet didn't know anything about the snake or even what kind it was (she was an Eastern kingsnake) they ended up bringing her into "the back" and she died a day after. She was perfectly healthy before I brought her to the vet.

Here is a picture of my brooks king, he's a good weight now. He was a little more thick in the picture above, though. I apologize for the quality of the image above, I will get better ones soon.