I have a US1M Mistral with 60’ luff homemade TrisPi 25 sails. I seem to have too much twist. When close-hauled the top of the main luffs first. When I try to pull the twist out with the vang I get a crease from the clew to about 1/3 to 1/2 way up the mast. Should I have more luff round? That was my first idea but I think that would put too much draft in the sail. I want to make my own sails and have put together about six sets. The jibs seem to work great-nice and smooth, but the main always seems to have to much twist. I have the full 2.5" roach. Any help would really be appreciated.

More foot round? I struggle with this on my EC12.

There is nothing - absolutely nothing - half so much worth doing as simply messing about in boats. Kenneth Graeme, Wind in the Willows.

The problem turned out to be not enough downhaul tension. One day I’ll know what I’m doing.(hopefully) Thanks for the suggestion.