Ahh Rolf, what you wrote is actually not correct.
To compensate for the "bending" of the airstream created by the jib, one want more twist in the top of a sloop main.
Actually to correct for the "bending" of the airstream created by the jib, one want LESS twist in the BOTTOM of a sloop main.
The top is best when it is about the same as for a boat without a jib. Afterall the mainsail top of a sloop rigged rig does not really see any bending by the jib, it is too far above the main body body of the jib.
And that is exactly what I'm seeing in the pictures. The A-cat appears to have more twist low and probably some more draft there as well.
