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A NGK "9" is a very cold plug. Your photo was a little blurry. I could not tell if the black color on the insulator was "fluffy" or "matte" or "shiny".
If all your plugs look the same (I bet they do), I would go down two heat ranges to a "7" and try that.
In order to get a really good plug reading, some mechanics specify that you run your car at the desired RPM (maybe max HP or onset of boost, for example). Hold that RPM for 60 seconds. Then cut the ignition and depress the clutch at the same time WITHOUT changing the position of the throttle. This reduces vacuum-induced deposits.
Good Luck,
Mark
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1991 964 Polar Silver Metallic Turbo Coupe
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