my humidity runs about 30 -50% just run a humidifier, my setup is a modified ebb and flow
on my setup i had a garden hose attached to my pump ( rubber off a washer ) i just poked a small hole with a pair of suture clips and inserted a small aquarium t then attached tubing for fish tank bubble pump its clear so you can see your fluid and blocks and a large diameter. i run for fifteen mins on 30 off , and i use hydro-ton clay pellets. ill try and get some pics for you later on today.
and ill in clude a pic of my grow. and im running 12 cfls in my 3x3x6 steel cabnet. so its realy close to what you have.