zandor the rootmaster...TexasT...go to walmart and buy a garden kneepad, this material works great, more density than what you are using and get some miracle grow leaf shine to spray on your clones as an anti-wilt...I basically copied Zandor's method except I also had a bubbler...just make sure that you keep your stem's 1/2 -1"
above the bubbles...check this out... http://boards.cannabis.com/showthread.php?t=25408 it is my clone/bubbler thread...if all else fails then contact Z for your supplies.
hope this helps. latewood