I always have difficulty setting my downhaul. Everything I have read suggests "minimal" downhaul.
It would be helpful to get a more useful guide. For example, how much downhaul from the point where the bottom of the sail sits before exerting any downhaul, or possibly how far the bottom of the sail would sit from the bottom of the mast when properly downhauled for each sail size for "average" or moderate wind conditions. (it seems that for these sails the amount of recommended downhaul does not change much from light to heavy winds)
I am only looking for a rough guide to start with.