I have tried a lot of New thongs and sizes and patterns over the last year. it seems that mid sized flies 14-18 work the majority of the time. however I have tied some pheasant tails on 16 hooks but tied them skinnier and shorter on the hook and had good luck. helps with the profile as well as hook set. in dries , love 14 elk hair for riffles but definitely go smaller on may fly patterns,. 16 Adams kill too though. I like the idea of no slip knots I may have to try this.