The +/- 2 cm works with Sailworks, Ezzy and Niash, and is based on looking at those 3 manufactures guides to rigging. Take a look at the latest Windsurf magazine, they have an very good article on adjusting outhaul and downhaul in modern sails and show the effects on the sail of these changes.
F2 Max2Air/Madd135 Powerex Masts
Tuning Tech for Sailworks/Roger Jackson
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