I'm also a fan of a larger hook primarily #4 but with some lakes over populated with kokanee producing smaller fish smaller hook will do the job. I quess it the size of the fish that populated the lake you fish. I also been playing with plastic making mesis shrimp patterns and finding the #4 will work just fine. I have been on You Tube a lot studying single hook fly patterns with I had excellent results with last season. One mistake I made doing my mesis shrimp. I left them clear, like they are naturally. I should of colored them.