Fastfish I remember reading that males only stay for a couple days for the eggs to hatch in warmer water. Cooler water a little longer. The guys brought up a good point about the wind taking the smell down wind and in some cases a good distance.
Funny how so many talk about the old timers using this, same here when I was taken by a older fisherman for gills. It amazed me how he would smell the beds as CP spoke of and then work our way to find them. Just a thought, but have you tried a dropper fly off the jig for a smaller presentation to imitate A scud or something like that? Maybe smaller will help.