It looks to me like you have a lot of twist in the main if you are going to windward. I would have sheeted the main in by about 2 meters :shock:
Your jib looks like it is blown out as well.

I think you would have noticed a very large improvement in control and handling in gusts with new sails. Less heeling and more acceleration and speed. I know this was not what you asked about, but it was what struck me once I looked at your very nice picture.

To answer your question, I think it is fastest to trim for max speed in the lulls, and dump power in the gusts. Tired sails makes this harder as the extra draft and draft position tends to drag you over sideways. Your trapping style is very nice <img src="http://www.catsailor.com/forums/images/graemlins/smile.gif" alt="" /> Going for a real trapeze harness will probably make it more comfortable, but you look good to me.