I've got a newair and use litter for humidification, but so far my experience had been that the unit's own fan is plenty to circulate the air. I split my litter up into three portions: a big bag at the bottom, a small bag in the middle, and a drilled pint takeout tub on the top shelf. It holds very steady if I can stop myself from constantly opening the door (very dry here the winter). I keep a sponge in another cut down takeout tub on the top shelf to spray with distilled water if I see rh start to drop.
It's not the prettiest setup, but it works. What I find made the biggest difference was putting my humidification media in bags (homemade, but you can buy the aquarium bags) rather than non-porous containers. It's all about exposing as much surface area as possible.