Heya,
Have you tried cloning with perlite in a wick cloner?

Have you tried using WiltPruf on your cuttings? You can get it easily this time of year since it is good for Christmas trees too.

I spray my mothers with Wilt Pruf twice before even taking the cuttings, letting them dry in between. Works like a charm... I use an ez cloner with no dome.

Also for lights... you are asking for trouble giving the little girlies that much light. All they want to do is make sugar if they are in the light. I use a single 70wHPS a good 18" above the cuttings.

I've seen this problem before actually, the guy I got my cloner from was using a NEw Wave T5 for his cuttings and it was just way too much light and they kept wilting, and he ended up having to put a dome over them even though with an aero cloner it should not be necessary.

In my cloning closet the humidity is actually REALLY low and between the wilt pruf, and the the dim light, it works.

Well anyhoo....That's all I can think of.