55 to 60 sq.ft. So as wind increases, windage forward overwhelms it's effect to power into the wind. at 33 knots, I'd be mostly beam to and my boat low freeboard hull has little windage.

Sounds like yours may be all you need for heaving to. When I think of the times a trysail might be nice, then I wonder would I have it in place before it was needed? If not, am I going to rig it then?

I think an extra reef in my main would be the most likely used heavy weather sail for heaving to.