Sometimes your streamer presentation just needs a little more to get fish to really take, so add a smile blade. While some fly fishing purists may disagree with this tactic - we've found it to be the most reliable way to get more strikes when nothing else is working. We were desperate when we first tried it, but were pleasantly surprised and now use them every time.
You probably won't find a smile blade at the fly shop, but you can find them pretty inexpensively on Amazon or directly from Mack's Lure. They come in a variety of colors making it easy to match any variation of streamers you have on hand.