I just snapped these photos of my curly leaf problem child. It is a hybrid grafted one, a single purple. It took two years before I had one inkling of a bloom. I've tried more water, less water, different types of fertilizers, no fertilizer, all sun to partial shade and treated for mites and aphids but alas, it has curly leaves and rarely blooms if at all. So until I can stumble on a treatment I consider it a curly leaf adenium!
If you find a cure pass it along, I will do the same.