Len, I generally try to keep them off the bottom in order to avoid snagging on rocks and stuff. Yesterday however most of the fish seemed to be in the lower water column so I kept the jig fairly deep. On days when they are in the upper water column I run it a little fast to keep it from getting too deep. One rule I hold fast to though, if you see a fish rise, always cast for the circle. As in the circle formed on the water by the fish rising. I would say about 80% of the time if I see a fish rise and I can land my jig in the circle before is dissipates I will get a hit and usually land the fish. That little fact drives a lot of my fly fishing friends crazy as they frantically try to match the hatch.