Tighten the heck out of your downhaul and outhaul. Steve Leo showed me a trick a long time ago:
1. Tighten your downhaul normally.
2. With your boat on the beach pointing into the wind, sheet in block to block.
3. Check your downhaul, I bet it is as loose as a goose... re-tighten it and let off on your mainsheet.

Keep your sail-plane as flat as possible. Your primary control sail angle is the main traveler, so you should use it to spill wind. The mainsheet should be secondary.

Believe it or not, there are times when it is too windy for some people. Heavy air can be fun, but that fun can be turned into danger real fast.