Thanks for your advice. I think the same sort of thinking applies for mast track position... further back = more speed but less control due to more lift.
I had a 5.3m until 3 days ago when it got stolen from the place I stored it on the beach... So I'm with a one board and one sail for the moment. I do have a smaller fin though, which I can stick on my board if the wind really picks up to help me gain as much control as possible.
JP Super-X 106l, North F8 Ram: 5.8m,