I've had great success fishing Black Copper Johns on streams in PA & WVA. Seems to be a great fly, especially for stocked fish. Black Copper Johns were the go to fly on a recent trip the South Central PA streams the first week of May. Bead Head Hares Ears and Pheasant Tails with flash have also been a very successful combo for me as well. I also do quite well on epoxy back nymphs, don't know that these qualify as flashbacks but the bubble over the wing case seems to work for me.