We love butterbeans fresh or dry.Butter beans are that green gold for us. We have tons of bloom but no beans. They are growing right beside the peas that have done so well so I know it is not the soil or pollinators. I have some pole butter beans (King of the Garden) I'm going to plant now and hope as a fall crop they produce.
I have no experience with King of the Garden. I don't know why they are not forming pods for you.
Have you ever tried Carolina Sieva Pole butterbeans?
I started growing it years ago and always save seed for the next year's planting. They have become difficult seeds to find for sale. Very old heirloom.
They usually do well even in the heat and humidity.
I should have enough seed this fall to share. Won't do much good for now but you would have them for spring.
Would you like me to save you some?