I have a 2004 ST3 which I acquired about 2 hears ago and finally got around to changing the rear pads on, which turned out were almost toast. As the rotor was close to minimum spec I also changed this along with a new rear caliper. While the wheel was off all bearings were changed by a workshop but the rest of the work was done by me. After installation, setup and a ride, I noticed that the rotor in parts had a slightly bluish tinge to it and was too hot to touch. The wheel seems to spin ok but with a light pad on metal sound. Another day I took he bike for a spin around the block and did not touch the rear brake. The rotor was mildly warm in this case. The pads are EBC HH as were the previous ones. The chain alignment was adjusted using a Motion Pro alignment tool so I believe the rotor is running true. Any ideas on why this may be happening?