The part of humidity that is not discussed is that it is a % of the amount of humidity the air can hold a a specific temperature. The cooler the air is the lower the maximum amount of humidity possible it is.

These is a complex calculation to work this out but there is a crude calculation that works. every 2ºF below 80ºF the air is add 5%. Every 2ºF over 80ºF the air is subtract 5%.

If you have 60% RH @ 74ºF this is too low for a good shed. You should have closer to 75% RH. Make sense. Relative humidity is relative to temperature and varies greatly.

Humidity is a funny thing misting is rarely a fix just a short term bandaid. You need to increase the water surface area with enough water that it does not evapourate completely too fast. A large low water bowl is the easiest way. The second part of this is humid air rises. So the size and placements of vents will have a massive impact on the humidity.

Different substrates can hold and slowly release water to the air until they dry out. Cyprus is one but once dry it is hard to rehydrate it, Coco coir hold humidity for long periods of time and can be rehydrated.

I agree with the humid hide they work and are easy, you should only add one when shed is coming. they work perfectly well, I personally choose to address the humidity issues and try to at least get inside the 5% of an optimal target myself. i find snakes kept below the 10% off of optimal start to suffer mild dehydration I prefer not to have this occur.