Belt issues

So I have two issues going on with my upper belt that I am going to replace. The first is I am getting some rubbing on the top of the belt near the motor/idler near the motor that I believe is rubbing on the idler as I have already adjusted the pulley on the motor. What are my options for trying to fix it other than disasembling the printer and trying to re-square the frame? Could I fit a space under the bearing stack to move it up? The second is that I have a spot on the belt that is almost worn through. There is no other wear on the belt other than from the rubbing and the other belt looks perfect. It is in the area where the print head would be centered. I'm assuming it is from a combination of over tightening and the belts that come with the printer.