Roger,
With that clip off, your caliper may have been engaging cock-eyed, and wore the pad down at an angle. Now with the spring on, its engaging properly, but the pad has not won back into its normal wear pattern...ie, just a little bit of the pad is contacting the rotor surface.
Try this to see. Spray some water on your cooled down rotor, and let it get that surface rust working. Then go for a quick ride and see what part of the pad is contacting. If its only a thin line wearing...it'll wear down properly in short time.
Next would be to do a quick bleeding...
Sorry...been wanting to use that trout slap!!
