In the lake I do most my fishing in in the summer, back in CB, we would watch the big hex flies pop up onto the surface and float around for a minute and never seen on fish chase them. LOL, for some reason they don't like the adults. Very pickey fish in this lake anyway. LOL.
One of my favorite patterns for this lake in the summer is a Bras D'or Creeper, but I use a thinner shell back, just wide enough to go across the back. I find it gives it a little more buggy look for freshwater fishing. I always assumed that maybe they though it was a large nymph, maybe a hex. I fish it along the bottom very very slow. I use to stay until the last min, 2hours after sunset, catching fish after fish on it.