Perhaps a different technique is in order. Swing something big across the surface of the water right over the top of those fish making a nice wake behind it. Hang on if you do, you may be surprised.

Out here we call the technique waking or skating flies and it is very effective for summer run steelhead. Sometimes they will swim up behind the waking fly and it will look something like jaws coming up from the depths as the water bulges up behind the fly just before the fish slams it. A take one never forgets no matter how many times it happens.