Go easy with the rooting hormone. Glopping or clumping it on hinders root development. I have never had one hormone work any better than any other, but whether using powder or gel, go easy with it.

The more clones you dip directly into the rooting hormone, the more contaminated it will become. I find it better to sprinkle the powder or 'paint' the gel onto the clone rather than dipping.

Raise the lights a bit. You want just enough light to keep 'em alive. Not too hot, not too cold.

Spray the dome, not the plants. The idea is to promte rooting, not foliar growth. (that'll come on it's own) Cut off leaftips only if necessary. The plant is using the nutrients from the green leaves to survive this ordeal. Don't go overboard with high humidity, either. Mold and damp-off are often fatal. Give fresh air a couple of times daily.

And one of the tips I don't hear mentioned much...when you cut the clone from the plant, place severed end directly into a cup of properly ph'd water. If an air bubble forms in the stem, it can inhibit moisture uptake. (like a blocked artery)