I don't know anything about Rapid Rooters, but yours look really saturated. Are they supposed to be that wet? I use Jiffy pellets, and while I make sure not to let them dry out, I also try to keep them from staying saturated for too long. Instead, I mist the inside of the dome a little more frequently.

Also, young clones don't need such strong light. It's overkill for a plant that's still trying to develop a root system. I noticed that when I used to clone on the far edge of an HID footprint, I'd get bad wilting. When I started cloning under fluorescents, I didn't see it nearly as much. Also, I like to cut the largest leaves on clones in half, to cut down on transpiration a little more.

I also don't know a thing about Hydrohuts, so I'd rather not offer any advice there. How well does it do at maintaining the humidity?