Rapid rooters are the best, good choice.
If you were like me my first time, I found out using the dome is pointless. it's gets to hot, and the humidity doesn't even get above 60%. Here's a photo of what i do now.
(Mango Kush)
I just keep them open under the light. I do not spray my clones at all. When you spray the clone, you are feeding its leaves directly. You'll sprout roots faster if you don't spray your clones, because your forcing the clone to put its energy into producing roots, because that's the only way it's gonna be able to take up any water. As you can see in the photo, i'm picking up the clone by the stock, and have got a few roots sticking out 1/2 an inch or so. Only 6 days from time of cutting. The leaf tips only started turning yellow the day or so before.
Oh and remember, just a little bit of water will work. if you put to much, it will add days till when you'll see roots.