Mine was grinding intermittently at first, but after a few long, hot and fast rides it started getting consistent and bad. I thought my pads were worn out, so I ordered a new set of ebc pads, have not arrived yet. After a 100 mile 75 mph ride yesterday, I decided to pull the pads and inspect them. They are no where near wear limit, but everything was caked in brake dust. I cleaned the rotor and caliper, and cleaned the pads and scuffed the surface with scotchbrite. I also changed the retaining springs to hold the pads in the direction of disc travel. 50 miles of spirited braking later, it is still almost silent without any grinding and the clicking is also gone.
When I get the ebc pads, I will give them a try but am in no hurry to do so now.
My theory on the clicking is that, with the retaining spring pushing on the front of the pads, the pads are pulled back away from the front of the groove they ride in, and when they drag on the a portion of the disk they strike the front of the groove then the spring pulls them back, and as the disc goes around again the same is repeated.
Just something to try.