I don't know where the spreader rake should be set for your weight and wind conditions but I can tell you how mine is currently set. The rake on my spreaders was set when I received the boat from Taipan America and I have not touched it. When I was in Australia, I measured the spreader rake on the new boat they let me use and it was set the same way.

Here are the measurements.
1) I placed a staight edge across the two diamond wires at the spreader and measured the distance between the edge touching the wires and the trailing edge of the mast. (measurement = 2.25")
2) I measured the outside distance between the two diamond wires at the spreader (measurement = 27.38")

Hopefully, this gives you a starting point.

A word of caution I remember reading somewhere about tensioning diamond wires. Remove the wires from the spreader before adjusting the wire tension or risk breaking something. I think Michael Coffman ran into this problem a year ago.

I've attached a picture to hopefully clarify how I measured the spreader rake.

Jennifer Lindsay
Taipan 4.9/F16HP #262