For ****ies only occasional bounces along the bottom (1 or 2 per drift) and use a long leader (at least 5 ft) so it will flutter in the current without settling to the bottom before the end of your drift. Slooowww retrieve in real slow water. In slow deep holes, particularly where the fish are rolling, I won't bother bouncing bottom; just use enough lead to cast where the fish are, let it sink some, and just swing it through the drift.