#1
I also found that often a spi boat points higher then a non-spi boat downwind. When I compare boats like Hobie 16's with F18's the H16 always tend to sail deeper with the boom swumg outward while the spi boats look for hotter angles.

Apart from that I agree with your drawing. However from a distance it is easier to spot and aim for a gap in the line and by reaching away you have giving yourself room for a hoist.

#2
The wingmark (seperation) is often below a reaching leg from A-mark. I your drawing you put it on a reaching leg. Reason to put it lower is to allow more seperation to happen before the mark is met. The spi boat will reach and then hoist there spi BEFORE rounding teh wingmark, So they'll steer two courses on the leg; a reaching one and a broad deep reaching one. The non spi boat tend to shy broad reach to the wingmark in a straight line

Wouter