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Hi MigsPIX,
Does your flashgun have a high speed setting (HSS)? I think what you're finding is that the camera is slowing the shutter speed down because it thinks that at ISO 200 it will underexpose the image. If you put it in HSS mode it will work with the shutter speed you manually select.
Personally, I find it easier to use the flash in the P (Program) setting and if the camera is slowing down the shutter speed I dial in some positive exposure compensation, take a test shot, view the result and adjust as necessary until I get it how I want whilst using the HSS mode.
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