It's a bit complicated with that boat, the bottom of the diamond wires was attached in different positions, some were at the front some at the side at various distances from the leading edge. If you haven't changed your spreader rake, start at 40 and go as high as 45 on the Loos guage. You have to have prebend with that mast so if 40 doesn't look like much you could add a bit more, mostly the difference will be your sailing weight. For detailed help you could email Rosco or Warren at "Brisbane Catamaran Centre" in Australia with measurements of your setup including the position of your spreaders, how long they are, what the spreader rake is and your exact attachment point at the bottom.