You're on the right track.
This link is great.
Barb

Here is a link that might be useful: Queen of the Tropics - propagation

I rooted all mine. I didn't use the method above. No rooting hormone or anything and left the leaves on. I put the cuttings in small pots and placed in a 10 gallon aquarium with an incandescent light fixture lid. I used a CFL bulb that was rated for outdoor light. They all rooted and very quickly (about 1-3 weeks depending).

I spray mist them every few days.

That situation sounds great - aquarium with grow lights. I'm going to be trimming mine back very soon. I have an aquarium (with fresh water fish), with my orchids on top and a grow light above. I'll try putting the cuttings on that. I have had bad luck rooting these guys, so I need to try something else. Although I have had great luck rooting Chinese Lantern hibiscus (Hibiscus schizopetalus) with the method described in the link.
Lets see how both methods stack up against each other.
Barb