I would not be surprised that some might becomes bitter after drying. I know the one time I got into a good batch of morels that they really INTENSIFIED their flavors after drying. In fact, even more so than you would anticipate. I rehydrated the last big one, chopped it, added it to a pot of venison stew and it was pure mushroom stew after that!!! One four inch morel diced into 20 pieces overwhelmed a 5 qt crockpot of stew. What can I say, I ate it all. I liked that spadeful of forest floor dirt in every bite.
Those are some lovely shrooms, Upsy! Do the kids eat them, too?