Not a common technique, and one I haven't used much in probably 20 years (where does the time go?), but in the slower stuff that you think holds fish, use a little heavier jig (depends on line size, and you guys know me by now - I fish ridiculously light, so I get away with a 1/4, but experiment with 3/8, and you can do what is now called "twitching" (we just called it "jigging" back then). Cast across upstream, like hardware, and slowly retrieve, and make very slight, slow tugs on the rod. In the right water, it's deadly. But don't be a snagger with it. We always used very long feathers for those jigs.
Biggest steelie I ever hooked (notice I didn't say "landed," because this thing was oh-wow-big, and wrapped me up on its way 3 miles upstream) was doing just that. Small hole on the upper part of a coast stream.
I think all but the smallest tug on a bobber setup will mess up your drift.