SD9;
Here, on the West coast, for metalheads, I use, three flies only for our 3 various runs...
The Knudson Spider, tied in yellow, orange, green. The Green Butt Skunk and the already mentioned Reverse Spider.
The only change I make on any of them, in with the Reverse Spider: I don't use forward facing hackle, I change that and use Amherst Pheasant instead, facing forwards.Right behind, the Amherst, I tied a small collar of grizzly hackle, to keep the Amherst, on retrieve, from folding back over the body of the fly and to make it stay more "erect".
"The Fall Favorite" and "Skykomish Sunrise" are 2 more, I'll use, but only when the rivers are high and way off color.