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Thanks for the reply, John.
Still unclear how do you do ambient exposure measurement?
1. My understanding is flash measurement ties to where your focus point is, in other words, flash is measured just before shutter is clicked, no flash lock used in your case.
2. Do you measure ambient with center point on some 18% grey subject, lock it, then move focus point to the one you will use, focus and take the picture?
3. Or you seperate shutter and focus, take a read of ambient and hold shutter half pressed, move focus point to right one, focus and take the picture?
4. One thing I found, if some diffuser is used and flash left not very close, say full body shoot, ETTL will always underexpose the subject, no matter how much FEC added. In this case, best way to do will shoot it in manual flash mode. Did you see this happened?