High humidity animals are those that live in environments where their thermoregulation and other biological functions have adapted to higher levels of humidity.

Higher humidity + no airflow is a bad thing. Many animals need humidity plus adequate airflow. There are exceptions to this rule. Ball pythons are not that exception.

What would you list the top causes of bacterial infections in captive snakes that are CBB?

When you spritz the crap out of a tub, in the morning, in the afternoon, whenever - you are affecting your gauge more than the relative humidity. You are wetting, not humidifying. You can place a water bowl on the heat source...but I can think of a couple problems with that in relation to the cycle as described above.

It is next to impossible to properly regulate a healthy level of high humidity in a tub. You may think you are but your not. You cannot fake science and you cannot BS your way around science.

To correctly raise humidity in a system with proper airflow you need to "introduce" a dew point at night and then in the morning gradually raise the heat. A tub with belly heat or back heat cannot replicate this cycle.

In other words, stop spritzing and use a humid hide.

I have used many tropical animals in tubs with no spritzing and 100% ventilated tops.

I use humid hides of one sort or another. I know other people that humidify the entire snake room.