I do the sandwich bag thing too when they start looking ruff and it always works. Just mist inside the bag and check and mist a few times a day. I remember having a problem with keeping humidity in any dome in this one cabinet so I had to use the bags on every clone, got to be a little tiring messing with all of those baggies, but I didn't lose a one.
Now I am just using my anti wilt and it is allot less work for right now, MG sells a cheap version called Shine Spray or something and it is supposed to work just as good as anti wilt spray, and for those who don't know, you just spray your cuttings after you place them in what ever medium your going to use, perlite, RW or a rapid rooter, and then spray the leaves all over and it keeps the water inside of the clone and prevents it from folding over like a praying monk. I spray the night I take cuttings and one more time the next morning and that is it until they root. Works for me.
Adieu