Was talking to my dad, an old pro wading Pymie for 40+ years. He told me that he thinks the lake is losing too much cover for the young walleyes to have a chance.
He remembers days when the lake was loaded with stumps and other cover. Most of it washed to shore or is deteriorating. He thinks most of those fry don't have many places to hide and become fish food.
As he put it, "Those walleyes are making other fish fat."