How long have you had him? Moving to a new home and enclosure is stressful even without shedding, so they do best with an adjustment period with limited handling. Most recommend that he eat 2-3 times to let him settle in before any handling, especially since he's a little baby.
Is your hydrometer located under a heat lamp? If so, it could give falsely low humidity reading, it's better to have hydrometers throughout the cage to monitor. If you have a hydrometer and it's not under a heat lamp and is showing low humidity readings, try covering the top of the tank (assuming its screened) with cardboard and/or shrink wrap so that its 75% covered. Consider using coconut husk mulch or coconut fiber as a substrate if you don't already. Coconut husk holds moisture much better. Placing the water dish under a heat lamp or over a heat mat can also increase evaporation and consequently the humidity. I'd consider buying a sphagnum moss to put in the tank too as it provides a good hide and holds moisture really well. They sell blocks of it on amazon for really cheap, and a block can go a long way once expanded with water.
Congrats on the new snake and you chose an adorable name. And the fact that hes new and not striking you is a good sign that he'll be easy to handle when older. A lot of babies and juveniles strike when they're in a new environment and being approached, and BPs are known to get grumpy when shedding so Rumples must have a really good temperment!