In the last couple of weeks we talked a lot about choosing the next fly, when to change, and what informs our decision about what to change to — basically, how do we develop that next theory about what fly, water type and presentation style we want to test.Last week we talked about watching how trout are rising to naturals, how they are taking our fly or even how they’re rejecting it. That information goes a long way. It’s often the predominant factor for choosing an appropriate fly sty...