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What mileage was done since rotors and pads change? My experience tells that you have to make about 500 km / 300 miles to get pads and rotors fully contacted. You know, the surface of pads and rotors isnt perfect flat and smooth, so the harder rotor made of steel must scratch many micro-grooves to the softer pads to bring close contact on 100% of the pad surface. Usually, brakes dont work 100% when new pads are to "fit" and you have to use brakes some time to get them work at 100%. And its simmilar when changing both rotors and pads.
And you said there is a black dust on wheels. I never used ceramic pads, but I think/remember ceramic pads are made of white/light colour ceramic material. So you couldn't get black dust produced. But i am not sure, as I said.
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