This one is interesting. (The other changes too, but I’m especially interested in all things regarding sailing.)
Somewhere else you stated that the first sail being set is much more important to the ship’s speed than the last one being set of the whole rig. That is true. The same is valid for wind shadows. A reduction of wind power by 33% due to eddies etc. will not lead to a speed reduction of 33%. The impact on speed will be much lower (about one order of magnitude). Will that be considered?
Other questions: Will the wind shadow be as big as in reality and shaped like a cone? Will the impact of the wind shadow vary with distance to the ship? Will the impact of the wind shadow on the ship‘s speed vary with time as the ship is seeping inertia over time? Meaning: crossing a wind shadow has almost no impact on the speed because it takes only a very short time. Sailing alongside in a wind shadow, however, has a much bigger impact over time.
Actually I’m a bit worried that there will be a block shaped wind shadow with 100% impact over it‘s whole area and 0 impact everywhere else.
But I do trust your attention to detail and your dedication to get things as realistic as possible.