I really wonder what your problem can possibly be, Cheryl. If my 4-5 month dormant (rooted) plumeria did not begin to grow again in the spring, I would have no plants at all. I "revived" over 4 dozen rooted, dormant plumeria this spring. Of course, you say you have only failed with two plants, so there could have easily been something wrong with that few plants. Just since April, I have already up-potted two dozen plumeria that were in one gallon pots, and they are all thriving as far as I can tell. Before the end of summer, there will not be a single plumeria left in a one gallon pot.
Do you have any idea what the problem might have been with those two plants. Plumeria are incredibly tough plants.