Re: main sail blown?
I'm in Alameda marina, by Svendsen.
I'll try to set up a vang. I had my standing rigging replaced recently and the yard tuned it. Maybe it needs some retuning. My front lower are very tight but my back lower are more loose, I think it's by design because the riggers set it up this way originally. although with the shape of my mast, I doubt it will arc much even in high wind.
Really, from my recollection of the last day, I really feel like only tension on the boom might make the sail flat. I think this is way beyond a small tuning of the mast.
I'll try to take a pic next time.