Looks like you did almost everything right and still flipped. I've been there done that plenty. Sometimes the force of the wind is greater than the weight on the boat to counteract it.

Pull your boards halfway next time. It will keep the boat from wanting to trip as much.

Nice job staying back and working as hard as you could to keep it up. I saw that you were so deep that the jib would lose air sometimes. And you were hauling butt.