Interesting. I did a spirited run a couple days ago and I feel the brake is amazing in spite of the OEM DS2500 street pads. One thing I notice is that your wheels seems awfully clean and not much brake dust deposited on the black wheels. My wheels were now in matt grey finish and covered with brake dust.
Two potential issues-
1. the brake pads and rotors were not properly bed-in yet.
2. you are not braking hard enough.
I think it is probably issue number 1. Try the following:
Who remembers those “Running in. Please pass” rear windscreen stickers? Nowadays new cars hardly need special treatment, but new brake pads do – for as much as 300 km.
www.ferodo.com