Wouter,
Thanks very much for that clarification - now it makes perfect sense!
Those are the kind of tuning tips that are so useful...
It is beginning to sound like it's more useful to tune spreader rake than diamond wire tension based on windspeed/crew weight (although maybe adjusting spreader rake will require readjusting diamond wire tension to get you back to where you started on the latter). Most boats have turnbuckles to adjust diamond wires before sailing and a few adventursome folks have added on the fly controls for that; so why is there not a way to adjust spreader rake without taking the mast down? A couple of very small hydraulic cylinders (and I'm sure there are other even simpler ways to skin that cat) and you could do it on the fly! I want one...
Jerry