I run 8:1, a cascade system, 4:1 driving a 2:1. Most importantly it must release fully so the system friction cannot restrict the sail from bagging up. Using good blocks and small diameter rope will make the rope run better through the blocks. Makes a lot of difference on my current sail with kevlar tapes holding it together and worked to a lesser extent on my old mylar sail though it would stay a little bit stretched after the first downhaul application. Dacron would be like stretching a piece of spaghetti.
Adjustability while trapezing at full stretch saves leaning in and guesstimating downhaul settings and allows the downhaul to be tweaked rather then dropping mainsheet in gusts.
Darryn
1704