Ok, I bought a set of rotors off eBay, decided to finally put them on so I changed the pads & rotors, etc. Went to drive the car and it felt like it was dragging. Came back home and I've got nice black lines on the outside of the rotor from where the pads are rubbing. Measured the rotor and it is slightly thicker than the stock rotor. The pads are fine on the backside, but on the front they are rubbing. Any suggestions?