One and a half year old snake, 50 grams?

[Pippers]

He's always been on fuzzy mice, because he's never grown. He's ALWAYS been 50 grams in weight. My humidity is always above 50% as I always have a damp wash cloth on top of the cage, and a water bowl underneath his "night" light. I also have reflective tape covering most of the screen to keep the heat/humidity in. Both times he tried to shed I sprayed his cage to about 70% but trust me, no amount of humidity would have let him get out of that skin..it was as if his body knew he wasn't growing but also knew it had to shed, so it started anyway. The first time, he got it started on his head but that's it. The second time, nothing (and his condition looked about 75% worse)

When you guys say underfeeding, do you mean not often enough, or too small of food. I have fed him twice in one week, as well as twice in one night, and he became extremely constipated both times (had to take him to the vet).

I also forgot to mention last night when I posted this, that his hemipenes are sticking out of his body..at first I thought they were dingleberries but the vet told me those were his hemipenes, unlike me, he didn't seem shocked to see they were out of his body. I feel so bad for poor pip, and I have thought that I weened out every possibility by giving him the best chance possible.

I am not trying to question what you guys know so I will switch to hoppers immediately, 5 days a week, but in my gut I feel as if there is something larger at work here. Jesus do I hope it's just underfeeding. I'll share some pics of my set up and the little stunted guy.

The "Insert Image via Url" isn't working for me, so I posted screenshots of my pics:
https://gyazo.com/d0e1f49a939b18378e17bbde42e850b0
I have 75 watt bulbs, I may switch to 100 now that I realize he needs more heat, however I worry that 100 may be too hot? There is a UTH under his rock hide, and that's a water bowl on his right side

The container weighs 100.5 empty, 163.0 with him there. And yes, I'm sure it's set to grams.

https://gyazo.com/fc044c705ea7d9e58188b880f6e22ad5

https://gyazo.com/aac9603feddad3049a7ef98f0d9b380b