Hello crizzleb, it is okay for your Plumeria to still be dormant right now. The plant itself will show you it is waking up once it starts producing leaf claws, but wait till at least one leaf is fully open before you start watering.
Summer time is fun time for Plumerias, the more direct sun the better, but before you expose them to such outdoor conditions, do it gradually, position first in part sun ideally morning sun, to acclimate to your outdoor temps and humidity. When Plumerias are properly awake already, it is okay to leave it outdoors rain or shine. Usually if I overwintered mine indoors, I wait till overnight temps is at least 50F, before I let them out. Just make sure your soil is very porous and gritty, especially if your summer is rainy. Our summer conditions in my area is different, extremely dry and very hot, so I often have to step up watering for my Plumerias especially if we are expecting triple digit temps and higher. Our dry conditions here is about 6 months of zero rainfall, so I really have to be watering it twice a week here. It may be different on your side, if it is much cooler and if you got more rain. Rain is good actually for them. Wish we have some of that in summer.
The tall growth of your Plumeria is just natural, after all it does grow into tall majestic trees if planted in ground.
