[Barnsnake]

If you have just a few miles on the new pads, take them out and examine the contact pattern. It is possible you have a caliper bracket that is not parallel to the brake rotor. this would reduce the contact area and clamping effectiveness.

Did you sand and clean the rotors when you changed the pads? If not it might be a good idea. One rotor could have some glazing or pad transfer.

Keep us posted.