I just received a new Windex 10 Sport windvane for my birthday. The installation seems very simple, however the instructions don't mention how to determine which angle to set the tacking tabs. All the instructions say is: "Set the tacking tabs at an angle between 45 and 65 degrees." I'm assuming the angle corresponds with how well the boat points/sails to apparent wind, but how do I determine the correct angle for a Capri 14.2? Or does it even matter?