You explained it better than me where the twist is and partly why. But I am still of the opinion that a sloop main need more twist than an uni main. If the uni and sloop was pointing at the same angle, I would also agree that the top of the sail on both boats should be identical.

Funny how disinclined most posters on catsailor.com is to discuss sailtrim and shapes. Especially so when considering that sailshapes and trim is one of the major points for making any boat go fast.