Your accounts of the stockings and success don't add up Bry. You claim they waste money by not keeping them longer, keeping them longer cost money and increases the chances of a big loss. I know they get their fish 8 miles from my house, and they do it in March, so if they're going to release them in the spring they'll have to board them a year. What ever they do, the hatchery fish don't have to run the gauntlet that the wild fish do
Some waters in this area do better than others and they have been in the major river systems for a long, long time. I suspect it takes deep oxygenated water for them and some our lakes are a lot deeper than others. LOZ has had eye's, AKA jack salmon for as long as I can remember and I think BS probably has also. LOZ has never been a hot spot unless you knew exactly where to fish.
Given the over all return walleye are most likely marginal in terms of $ and opportunity for the state and its sportsmen.