Front Pass. Side Brake Rubbing 2004 sport trac

I'm in a 2004 Sport Trac XLT (non-4WD). Start of July I replaced both Rotors and all pads. I noticed some uneven wear on the front pass. side and was concerned that the caliper was sticking. Drove it for a few weeks and had a slight rubbing noise at low speeds occasionally at the beginning of the drive that seamed to go away. Being nervous it may be from the sticky caliper I replaced it too about 3 weeks ago, but the rubbing noise has got worse. It appears to do it mostly after backing up and at slow speeds shortly after start up after the car has been sitting a while, but then seams to go away. It's intermittent, but annoying. I plan to pull the wheel off and look at it today, but wanted to get some thought on what to look at that I might be missing. Thanks in advance for the help.

Thought i'd mention too that the pads are ceramic. Just in case this is typical, but i can tell you I do not like it. I have pulled it apart again this morning and all appears to be okay??