Really Strange Rotor Wear with PBR Calipers

[dtmaso]

First of all my car has never stopped as a car of this caliber should, without putting heavy boot to it. (A 440-6 Pack Cuda with drum rears would stop faster!)
Several months ago I finally needed to replace the rear pads and turn the rotors after a spirited day at Sonoma Raceway. After doing so, and bedding the pads properly, I drove to Roger Kraus' shop in Castro Valley for much needed rubber. I then discovered that the outer right-rear pad was not contacting the whole rotor surface - just the outer circumference and turning it blue. I checked the mounting hardware etc, and all looks as it should.
Before I throw money at it, what do you think is the problem? (Besides having PBR calipers on this thing in the first place).

[DWRAT]

It's not clamping down square, has to be your caliper.
I bet in time the pad will wear down to full contact.

[dtmaso]

That's what I thought, too - that the pad will eventually wear square to the rotor. But I'm concerned with the bluing as well. You have a PSI force normally distributed over the entire surface now reduced to half the area thereby creating more heat. And how long might it take to 'sand' that pad down?
In the meantime I don't have optimum braking - which was pitiful anyhow. I did read about the Superformance/Willwood caliper upgrades done that resulted in going from a 34mm to a 41mm caliper. I've contacted Superformance and am awaiting to find out if it's still available.