Can anyone help me with a casting problem. I have fished all my life but only started fishing with a double handed rod recently. I have watched several videos on Spey casting, however, I continually have a problem when trying the Spey cast. When I am delivering the forward cast the fly more often than not hits the main line and the result is either a tangle, or the fly and leader drop in a heap. Can anyone tell me what I am doing wrong.