i use my 8.6 overdrive about 3 times a week in anything from 10-20knots and love it. I've always had a couple of different settings, one for anything up to about 16knot then I put on another cm or so downhaul if there's more.

with the extra downhaul it defiantly has less power but at the same time it make the whole setup Inc board seem harder to sail, I've always put this down to the obvious fact that's it's windier and the seas normally rougher.

But recently I've done some experimentation and I've come to the conclusion that the extra downhaul is not helping at all. While it has less power things seem to bounce around more and are twitchy. With my normal lighter wind setting yes there's more power but if I just go with the board settles down much better and once moving everything seems a lot more controlled. You just have to get used to going much quicker.