One of our local waters is currently producing a may fly hatch. The fish will only take dry fly imitations of the fly. I made several but they are sinking. I've waxed the thread, used turkey points for wings, and grizzly for the collar. I use silver French tinsel for the rib and black dubbing for the body. I believe the dubbing is causing the fly to sink. I have squirrel tail, peacock heral, and bucktail that I could substitute for the dubbing. Any suggestions would be appreciated. I have the pattern down but I tie mostly wet flies and dry flies are fairly new to me.