Coho tube flies?
In my past as a coho junkie, I found tube flies to be great for saltchuck salmon because they provide a way to get the hook back in the rear third where coho make the crippling strike when you are stripping really fast to get them excited or when you're bucktailing them in the wash.
Long shank hooks make a big difference as well. I hear that Clouser's Deep Minnow is getting popular but with the hook so far up front do you miss a lot of strikes?
Species like striped bass will hit the head and you can fish a foot long fly with a 1" hook up front and they will get hooked. My experience with coho (and I could see them from the boat) was that they hit broadside in the midsection of the fly and thus don't connect as often with a hook tied in up front.