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I'd stick with Shutter Priority at 1/250th and try to make sure that I'm getting on the wider apertures - isolating the background a little. If 1/250th is giving you a smaller aperture you should move to 1/500th. You won't get the subject sharp and background very blurred with your 18-200mm lens, as the aperture canl probably only open to f/5.6 at best..... but that should 'throw the background off' to some extent.
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