Hi, I downsized from a 150% to a 135% genoa last year. My opinion...the 135% is a "right sized" sail for the 320. If you get one, get it with a luff cushion and UV protection strip that is the same color as the sail. Sunbrella tends to sag after multiple seasons, giving you a barber pole look on the forestay.Gene Musante 617-755-0680 gmusante at msn.com