Thanks guys,
Gestalt that's very well explained. Got a much clearer picture in my head now, especially the sail control while in the air.
I've tried the push the back foot down before the face method but it always seems to kill the speed (as you said) and I'm left floundering in the water completely off the plane. The only times I've gotten the fin out of the water is just heading straight for some steepish chop and not worrying about the 'ollie' part.
Of course, once the fin's out of the water everything goes pear shaped very quickly

Not really about to try Windy Miller's method... call me chicken if you want

What about angling the board so the wind catches the bottom? (Sort of like pushing the downwind rail down) Does anyone do this?