I'm a sailor in real life so sail handling is second nature to me. Yes, I de-power and it used to work before. Something seems to have changed in the sail "physics". I put that in quotes, because the devs mentioned long ago that they didn't intend to make a sailing simulator and the sail physics are artificial. Still, one should not sail ahead from a dead stop when the ship is headed at any angle into the wind with the sails aback.