Andreas,

I think that you are saying that the "S shaped" battens are "S shaped" when viewed from above, or below; from a "plan view."

I have diagnosed this problem, three different times. In all cases the cause was attributed to batten cap ties that were too tight. Often, you may think that there is no batten tension when you hold the batten, but the batten may be bent while you are holding it.

I suggest that you untie the battens and leave them untied while you perform a test hoist, and test trim.

If you are in a place where you can capsize your cat with the main trimmed to maximum tightness, you can then tie the battens snug while the sail is sheeted tight. This will ensure that you are not over tightening your batten tension settings.

Please let us know what finally solves your problem. Also, if your description of "S-bend" is different than mine, please tell me your description.

GARY