did some tests myself over the weekend. tried a different approach which I am very happy with indeed. I'm not sure if it was a fluke due to the lighting conditions but heres what I did.
5D, 24-70L @ 24mm (Circ Polariser Filter Fitted), 580EX
1. Set Manual mode
2. Meter off the sky only (to get a nice blue sky) I use partial metering. This gave me 1/125 @f8, ISO 100
3. Set the flash to have no FEC, aim it straight at the subject, no stofen etc.
4. take your shots
results:
Both straight out of the camera, no adjustments whatsoever.
I'm really happy with these. The second has a funky feel to it which I like. The great thing about this technique is that I just left it in Manual, fired about 30 odd shots over the next 10 mins and all were spot on exposures. I think this is kind of like setting an incident light reading by metering off the sky.
Now I'd be interested to see how this technique would work for different times if the day, brighter/shady days etc. Aiming the flash directly at the subject does a great job of lighting up the face (eye sockets) and gives a nice feel. It also helps to give a shot some punch.