From the hobie pdf page 7 above, the best tacking and gybing angles for that polar would be 100° and 100°. (points at 50° and 130° on the plot).
Those polars show straight-line speed, not VMG. Depending on the conditions, it may very well be better to sail higher/deeper to get around the course faster.
On a Hobie 16, I have seen that when the wind shuts down, and the race isn't abandoned, the best course downwind is as straight to the mark as you can go without gybing.
Mike
