with Tarev, maybe it needs a little bit more time for it to bloom. Make sure it gets full sun of 8+. I have several Plumerias and I only have three blooming right now, and I have to give away this one.
To answer James, nope I don't know anyone I zone 7a. I gifted a healthy plumeria to a friend in Michigan and I feel bad that it's been 3 years and he has not seen a single bud on his big healthy plumeria.