I run DoctorDiff's 11.7" rear disk kit on my Duster and haven't had any issues with the parking brake holding the car on a hill in either direction, my driveway is fairly steep so it has definitely been parked on a hill.
How many miles are on the rotors and pads at this point? Is the picture of the rotor you posted the current condition or just a picture from when you first installed them?
I tested my car and found the number of "clicks" pretty hard to count accurately, can you take a picture of the lever with the park brake fully applied? Or maybe count the number of ridges visible on the park brake lever when it's fully applied?