A buddy of mine used to have the same kind of setup in his basement, and alway had a problem with Humidity. Which is weird, i would think with a basement being dark and moist that Humidity wouldn't be an issue. I dont know if this is a finished basement or just a basement, but he used to keep a Humidifier in one corner of the room and one in another corner. He had a tarp like plastic streched across the ceiling and the floor, which i guess helped with locking the Humidity in the room, instead of rising to the ceiling and evaporating it would collect on the tarp and make its way back down to the floor. Just something i witnessed, i have zero time with this myself.