Un even rotor/pad wear

70Dart with Dr. Diff 73+ disc brakes. The pads don't look like they are clamping the rotor evenly. I also noticed that the single piston of the caliper doesn't sit in the middle of the pad back. (See pic) Not sure if I missed something upon install. Master is manual 15/16 from Dr. Diff and just a drum distribution block (rear discs also.)

There is under 150 miles on the setup as I was in the middle of a 4 speed swap shortly after the front brakes were done. What should I look for?

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