fp,
Try fishing chronomids or nymphs on a floating line with a 12' taper below a small poly yarn or cork indicator and the 'mid tied on with a loop knot rather than a clinch knot. The loop knot allows the 'mid to move seductively with the wave action moving the indicator at the surface. Adjust leader length below the indicator to put you where the fish are holding (from experience, too much leader length puts your bug in the mud ) Slow finger twist retrieve or let the breeze move it. Takes are usually very subtle so tighten up the line at the slightest swirl of the indicator.
Good luck!
Michael