Well, here are a couple of ideas if you haven't found anything yet. Check to make sure there is no
oil or grease on the rotor. Inboard brakes have a habit of becoming contaminated if you have an engine
oil leak, trans leak, or differential leak. If all is clean, then make sure everything is tight. Last, bleed the calipers. It is possible you have air in one of them for some reason.
One last thing...is your caliper in working order? If one of the pistons is not working, this might give you uneven braking also.