for that door, use like, clear plastic to go on the door, and tape it with artists masking tape about 6 inches from the door on either side. That way you can still open the door because the plastic will do what a band-aid does on an elbow. When you close the door (bend your elbow) the plastic (which really is like a band-aid) stretches and covers the dent (cut) and when you open the door (straighten elbow out) the plastic will do an accordion-esk bend.
That dent is definitely effecting FE, try the plastic thing first and see if you notice a change in sound.
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