I have a lot of weather helm on my Yamaha 25. This year I bought a new mainsail which reduced the weather helm but still the problem exists. I tuned the rig according to the manual but have not measured the forestay. I don't think I have an adjustment on it as it is furling. The mast seemed near vertical (1.25 degrees recommended) when I set it up last year. I have an adjustable backstay and know how to use the outhaul, cunningham, etc to reduce helm. I'm wondering if I adjusted the forward lower shrouds too tightly last year or not enough. If I still have weather helm, how can I adjust the lower shrouds to help this? I'm thinking I probably have to shorten the forestay!