This post is pretty technical, but I'll keep it short. I did a little test a while back to see how my camera could wirelessly sync the flash, faster than the max sync speed—in my case 1/250th of a sec. Using PWs, 1/250th is safe. But 1/320th introduces a thin black line at the bottom of the (horizontal) frame. This should be fine, if you need that extra third of a stop. Increasing the shutter speed increased the black area. At 1/500th it was about half the frame, which makes sense, since it's twice as fast as 1/250th. 1/1000th leaves only a tiny light sliver at the top of the frame.
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