What I've found works best in this situation is a trace of #32 griffith gnats, lightly dressed, on a 14x leader. Never quite let the flies touch the surface. Just as three gnats are fluttering down and about an inch off the water, pick them up and recast, once again letting them slowly settle down to but not touching the water. This is best accomplished with a 16-18' Tenkara rod with a Spiderweb leader. A killer set up in the situation you describe.

And seriously, lots of good advice I'm taking to heart above, but I'd still try the streamer and hope they're not too focused to pass up a real meal deal.