In light air, sailing to windward, I like crew weight to be to leeward, inducing the boat to heel, because it reduces drag somewhat and gravity causes your sails to hang in the curved shape that drives the boat, instead of hanging limp, like a sheet on a clothesline. It also helps keep the boom from swinging from side to side in the light air and boat wakes. Also, I like crew weight to be slightly forward, on the leeward side, at about the shrouds, because it raises some of the boat's fat stern out of the water, reducing wetted surface (which reduces drag).