Just found this after having been away for a wee while due to illness.
With one suit of sails, at anything over 5 or 6 kts windspeed you are facing a few compromises in setup.
A few of the tweaks that have limited the trouble I can get into in strong wind conditions with the SeaWind.
1. Run with the mast rigged with significant back rake, BUT, when the rigging is all nice and tight, loosen off the backstay so that it maintains enough tension to support it's own weight, ie it doesn't sag. Howzat work then? In light to moderate winds the forestay and the 4 sidestays will maintain the mast's appropriate back rake, however when you need the mast to move forward to reduce the weather helm in stronger winds (but not to the point of going into lee helm) the wind itself will push the mast forward through acting on the sails. It will do this though overcoming the sidestay tension, taking up the 'slack' in the rear stay, but prevented from over travelling due to the remaining tension in the now wind tensioned rear stay. When the wind drops the mast rakes back again, and your mild weather helm resumes.
2. Aiding the above, if you have the capability through servo travel to allow the sails to go out at 90 to the centreline of the boat, do so. It can allow the worst of any sudden squall to literally pass straight through the boat.
3. Keep the leading edge of the foresail tight when the boat is at rest, otherwise it'll try and corkscrew in strong winds.
4. Try and keep some shape in the rear sail - no major creases!
5. When letting the sails out adjust them so that foresail goes out about half inch more than the rear possibly a little more.
6 Remember if you can't turn right 90 degrees, try turning left 270 degrees ie go the long way around and keep adjusting your sail tension all the way around.
I think that's all....
"xxxxx"! I've given most of my SeaWind survival tips away!
-Rob