What I'd like to add is that to me it's not so much the fly but more reading and fishing certain water more. A salmon is a shark and will be more aggressive in the right conditions no matter what's in it's way.
There are places you see lots of fish in corralled . Not my gig or water so I think your throwing the hail Mary. Other places are rock hound conga line windmilling, great location, poor conditions to fish.
Those places produce fish no question. In my years I prefer to fish 4-6 deep broken water. Seeing moving, holding fish allow me to figure out what fly they want or don t.
In a swing condition I absolutely want to see the river bottom, I do not want to lift my fly at all , I want it to swing at 2 feet below surface. When fish move towards your fly, your heart leaps . When they don t, you change flies or location.
Last season was pretty fishy, my go to was casting behind lots of fish and having them slam a size 8 egg on the dangle.
If there is active fish moving, there is no need to leave a spot but ,figure out the fly.
If the fish are running around in a barrel with spears thrown at them, then throw dynamite, it may clear the hole out .