with everyone, don't cut the tip just yet. I have 2 King Kalakuas that were 3 feet tall / 3 years old from cuttings before it bloomed. I bought 3 No IDs ( peachy-pink and hot pink colors), which bloomed only when they were 3 feet tall. I placed them in full sun (8 hours+ in summer). It works great for me that they are tall because I plan to place them behind my medium tall plumerias and miniature and dwarf Plumerias. I mix superthrive with my blooming fertilizer when I feed them, not sure if it helped but I was very happy with the result.
I bought a seedling from a nursery that is almost 3 feet tall (no branches), I am being patient because they may not bloom for a few years. This might be a candidate for a downgraft if it will not bloom this year.