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Keep in mind that water misting requires pressure. The drain plate I used for the bottom cooler allowed water to flow through with just gravity. On my current build, I used smaller holes, and more of them, which should provide better cooling efficiency. Also, if the water gets misted, it's also extremely likely the fans will blow the misted water out of the cooler completely.
well there is always pressure in a water cooled system, if there wasn't the liquid simply wouldn't move. I don't know if you would actually expel the misted water out of the system, via fans, but in any case there would be more evaporation taking place. In most water bong setups the users are not exhausting air, but drawing air in via intake.

for example.
I've already told myself, the next house i build will have 100 feet of copper tube shoved into the ground in a loop where ever my computer room is located, and will use that for cooling.