What makes for a fast stance? I've been trying to get my weight out and back but today there was speculation that keeping the sail as upright as possible is the go... Please share your tips.
Soft back leg strong front, as little weight on your feet as possible.
Don't dig your heels in as it buries the windward rail.
And going on from Elmo, keep board flat on the water especially when going broad in flat water. That is, don't dig the tail in or rail the board at all. Keep sail as upright as possible, use longer harness lines than you would say on a slalom or wave setup and you want to imagine the sail power coming through your front hand, traveling through your body and driving through your front foot. The back foot should be neutral and flat and almost pulling upwards but don't over bend at the knee. Sounds strange but seems to work for me at the moment.
One last thing - keep trying new things but only change a little at a time, assess and then adopt or discard changes. Everyone is different so you have to work some things out yourself. Enjoy! 
Wow, I've saved that as I am a Booger, my board is blue, shame the flippers are the wrong colour
watched clip u/ tube instructor says pull down on lines getting lowest centre of gravity.makes sense to me. use hook that slides laterally helps to keep weight low and forward,[to keep nose down].
max backfoot pressure on toes to lift windward rail up helps board surf chop.
many different views ask chris. lockwood hes not that slow.
