I'll probably get flamed for this but here's a light air trick that I use. Ever notice that as you start a tack in light air your telltails (especially on the jib) scream lift. The reason for that is that a boats rotation through the air effects the apparant wind causing it to shift aft, more so at the bow. To take advantage of this shift the sails need to be eased through the first half of the tack. Some people do the opposite, and trim as they turn but that will just kill your speed in light air. I find if I ease in the first half of a light air tack I come out of the tack with more speed. OK...flame on.