RH under the dome should be a lot higher than that. Do you have a good seal around the edges? If you aren't using an anti-wilt, you will have to mist the inside of the dome more often.
I avoid nutes until the clones are rooted, planted, and showing signs of upward growth.
Finally, you really only need the single CFL. Too much light makes the plants active- photosynthesizing and using up stored nutes for vertical growth- and you really don't want that yet. It's like trying to go to work and the gym and the grocery store instead of staying in bed recovering from the flu. Let them tell YOU when thye are ready for nutes and strong light.