I am not sure that spreading the hatchery season out is a good thing. At least not on rivers with a healthier than average run of wild fish. A good model for me is the Bogy and Calawah hatcheries. This is also where you may see some of the problems you mentioned Micro. because of the hordes of fish stacked by the hatchery and that this fishery is the only game in town in Dec. It can be short and sweet with hopefully little impact on the native runs.
_________________________
"A river is remarkably like an elm-tree, and it requires but little imagination to picture it standing upright, with all of its lakes hanging upon its spreading branches, the topmost eighty miles in height.
John Muir