I haven't potted up my recent plumeria cuttings that were given to me, but one large one with an inflo on it has bloomed and it is beautiful. Can't believe it was flowering without being put in soil. I'll stick to the way I've been potting them up too, if it works don't change it.
These cuttings are very large, but do have some smaller cuttings in pots. I've read it takes 3 months for the roots to form, I'm not patient.