The settings vary greatly on conditions and points of sail, so hard to tell you what to do.
What I do for close hauled in light air - light downhaul and outhaul, traveler centered, adjust course till both lower telltales flow back, set mast rotation, finally - sheet down till the upper frontside telltail flows like lower. Basic textbook trim. It's the last part that I can't do, I can't sheet the twist out. I assume the problem is my old, dead sail. I assume it SHOULD be possible to pull out too much twist and hook it to windward.
What I should do is replace the sail. The BIG QUESTION - but is it safe to buy a used sail that looks ok? What are the chances of finding a good used sail or should I bite the bullet and spend the $$$$$$$$$ for new. What do I look for in a used sail? What fails first? How bad is bad? how old is old? How much delamination is too much? Is a bit of mildew the kiss of death?
Don't get me wrong - This H17 is great fun. For $1000 I can't complain about the 20 year old sail. Am I foolish to think I can find a good used sail?