I sail a Tornado with a square head. I agree with Mike and Mark about the best way. As the true wind increases, the apparent wind will veer, so you could steer up a little. At the other side you have to give the boat time to accelerate and the apparent wind will veer back. I think the best way is to give sheet, however a too much twisted sail is less effective. The jib may be crucial. With the traveller you close the gap. But even on a A-cat they will use the sheet in a gust. So probably twisting off is not so harmful.