Did they send you bedding in instructions with the brakes? Looks like the pads weren't bedded properly and a lot of material transferred over. Or you were on the autobaughn and slammed on the brakes and sat there for a while.
I'd say hit them with fine grit sandpaper to get that stuff off of there and try again. What brand pads does their kit come with?
FWIW, I run Z1 slotted rotors at the track with PFC pads and OEM brake lines and have never had any problems like what you are showing.
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2011 Nissan 370z Black Cherry Sport Pkg - Daily Driver, , 1960 Morgan +4 fun car, 1986 BMW 325ES, 1998 M3 and 1996 Spec Miata - Race Cars
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