I have been struggling with a problem for a few months now. No matter what I tried, I could not get the information form the Title field to show rather than the Title in the document. I was doing this for a specific site collection. As other posts advised , I did move "MetadataExtractor" down in the list of mapped properties. This had intermittent success. Just when I would think it was fixed, I would find another document that still wasn't correct ( either in a different library or different document type ) . I finally removed all crawled properties and mapped Title to another crawled text property that I have added to the site collection. Title was still showing from document properties. So then the farm admin mapped Title for the farm to another user text field. So now Title is showing as the text field mapped at Central Admin and not the one locally.
I thought that the mappings for managed property on the site collection overrode the mappings on the farm. Is this just happening because Title is a special field ?