Thanks for the reply Kevin.
From that, my take on it would be to bear off to get maximum speed and carry that speed onto the face of the swell in front. Then do s-turns on the bottom half of the swell, making them tighter as I slow down.
I guess the plan is to lose as little speed as possible on the bottom turn and cut the top turn as smooth and tight as your board will do without scrubbing speed off.
I'll give it a go the next time I get those conditions. Sounds like I will need to use a slightly bigger sail than usual too, to get the power.