Nice looking pawpaw Strudeldog. I have a number of the named varieties, but so far all of the flowers have dropped. They are quite tall and full, so maybe next year. Do you notice any bitterness or aftertaste with Sunflower? I have tried pawpaws at Edible Landscaping and they tasted better than the wild ones, with no noticeable bitterness. I like the wild ones I find here, but like you mentioned, eat them when they are just ripe so they are tasty. My first experience many years ago I allowed them to overripen and the smell and taste made me never want to try them again. I'm glad I did though, properly ripened, they are a treat. I especially like them cold.
I find pawpaws in open woodland near creeks and rivers where the soil is moist and rich. In the wild, they tend to be tall, thin trees with big oblong leaves. Sometimes you will find many trees and no fruit. They can sucker, and it's possible the groups of trees are the same plant. They need cross pollination, but even in areas with many groups of plants, some just don't fruit or do so lightly. Some plants will have large clusters of fruit and the ground with be covered. They are ripe when they drop easily from the tree. I usually look up into the canopy and give the trees a shake. They bruise easily, and this seems to increase bitterness. Most bitterness is near the skin. Selected varieties have been selected for size, flavor, high flesh to seed ratio, and lack of bad aftertaste.
Mike in Hanover, VA