Just a couple suggestions on things to try.
Try tying those with either a straight eye hook or a 60 degree jig hook like an Eagle Claw 413. Add a non slip loop knot and you'll get lots of jigging action.
Also, tie the Krystal Flash into the pattern in front of the eyes. You can then add bucktail over it for the top wing.
Lastly, rather then adding Krystal Flash over the bucktail belly, use silver Flashabou. Tie in the flashabou first, then the bucktail belly on top of it. Leave it longer then the belly bucktail and you'll get a nice flash tail effect that coho like.