I looked at your plumeria rooted cuttings closely, they are still in a very early stage of growing so the roots may not be totally established. It also looks like one is trying really hard to give you a bloom, nice looking inflo forming there, you will have a nice bloom in a few weeks.
If it were mine, I will let the soil dry out a little bit more (which could mean keeping them outside this week-end to get more sun). Then keep them on a dry side....going forward (moist is fine.), giving it as much sun while temps are not yet in the 40s. (I sometimes bring my plants in at night and haul them out daytime.)
Also, are you planting the stems really deep into the soil? Just curious. I like to plant mine 2 inches below the soil line. If top heavy, I stake them right away to help support it.
