I'm sure your baby easterns like the higher humidity. They come from a higher-humidity region of the world.
I prefer to keep my room on the dry side. I have experimented with humidification. Since I use a bedding which is part pine shavings, when the humidity gets higher than fifty percent, wood mites start to grow on the pine shavings. In most circumstances, they don't hurt the snakes. But they become so abundant that they can cover the surface of the water bowl with floating and drowning mites. That just bugs me.
I also prefer that the snakes fecal waste dries out. I use a bedding which I term a "composite bedding" which is very effective and allows me to go for longer periods between cage cleanings (before you all hypercleanliness nuts jump on my back, why don't you wait and I will post the method soon OK?). In moister situations, the snakes waste stays wet longer, and can spread around the cage and onto the snake as well.
The only disadvantage to drier air is that one out of twenty of so sheds is incomplete, and I have to peel off a little shed, or an eyecap scale. This doesn't bug me.
Robert Bruce.