I have been tying some beautiful Clouser patterns, and they work very well for silvers, cuts, and bullheads . The problem is that I can only cast them about 15 or 20 times before either the dressing slips down into the bend of the hook, or completely twists on the shank so the bottom of the pattern is on top. I use wet fly cement v.s dry fly cement, and even gloss the shank on the initial thread wrap. I also tried a wire wrap, and that helped with the sliding, but it still will twist up-side down after awhile. Never had that problem with trout flies. The only other thought I had was that my intermediate sink tip is too heavy, and when I double haul that line way out there it creates too much torque on the water logged bug? My store-bought flies take a real beating too. I don't even use peacock herl because it seems to just rip up too quick, and a tinsel wrap always comes unwraveled. The most durable materials seem to be antron, bucktail, and flashabou. Any thoughts, or suggestions would be appreciated on why I am having trouble with the fly dressing slipping on the hook shank.