I've notice that when you do course correction by clicking on the water(setting a way point), the sail are automatically set to 3/4. To go faster you need to re-order full sail every-time you do course correction with the ']' key or clicking on the interface. Also you can't control sail setting of a group, only for individual ship.
I think that if you use the arrow on the interface the sail setting don't change (i'll need to try this one to be sure)
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