lol..If you think dumping a full glass of water all over the cage is the same as misting then, my friend, you really need to do some home work. BP don't do well in high moist environments anyway so misting them is something that probably isn't a regular thing (if at all) with most owners. If your having problems with your humidity then try using an old butter container with lid and cut a hole in it so the snake can get in it, then place a moist paper towel in it and let the container sit on the hot side so that the moister can evaporate(This is called a humid hide and works great).

What are you using for a cage lid? That is probably your problem, if it's a screen lid or something similar then get rid of it and try and find something solid, but from the looks of your pictures I see your using an aquarium and that would just kill any air flow. You may want to think about switching to a rubbermaid plastic tub and drilling some air flow holes in each corner, you can find huge rubbermaids these days that are even clear so you'll be able to see in. You'll have a much easier time trying to controll the environment inside with a tub then an aquarium. But what ever you do stop dumping water into the cage, BP are not frogs and don't need or want that, your just opening up a can of problems( too many to name them all).

As for feeding Live prey, that's something you can do on your own because there are alot of info on this all over about why this is a bad idea.