tommy4132 wrote:I have had water pouring into the boat and was still able to ride it out.
That matches my experience.
The DS, if overwhelmed, often responds by violently rounding up, rather than capsizing. I've had that happen 2-3 times, and it is a bit scary, and because of the sudden course change also disorienting.
As far as I could figure it out, the cause each time was a sudden gust with a big wind shift, which may be different from sailing the boat on the edge and then running into stronger wind.
When you sail "at the edge" are you hiking out?
People used to keelboats have asked me "shouldn't this heel further?", but usually, it's more efficient to keep the DS flat, the exception would be light winds. Some heel will help the boom and sails to fall to leeward so the wind doesn't have to overcome gravity to create sail shape. Also should reduce whetted surface, which is the leading contribution to drag a low speeds.