Humidity is much like temperature it requires a balance. The issue of why so many have troubles is understanding it is very poorly understood. The first think to remember is humid air rises, so vent placement is critical. I am not a proponent of blocking vents, I would move them. Vents at the top allow warm humid air to exit. Personally I prefer to have vents ¾ up the sides and close to the bottom this helps maintain humidity and heat.
Humid hides are absolutely an easy fix add one at the first shed sign and remove it after a shed it is super easy. More water mass (water bowls) works well too often combination of altered venting and larger surface area will do wonders.
Misting is always a short term fix, it generates a large surface area but has low mass and evaporates quickly and then everything returns.
The RH scale is quite poor sadly. By its self it tells little to nothing. The question a % of what? asking for a 15% deposit on a snake is great but if you don't have a price it is pointless. Relative humidity is a in % of how close the water in the air is to the saturation point of the air. When the air is saturated you get 100% humidity and condensation. So 50%RH the air is half saturated. The complex part is as the air is warmer it takes more water to saturate the air. So warmer air you need a lower % to get a good shed than cooler air. A poor shed could also be a low ambient air temp too.
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