Setting EnableOptimisticTitleOverride to 0 still gives wrong Word document titles?

The Optimistic Title Override feature shows the first sentence of the document as title in search results instead of the actual title property. I followed all steps to disable this in both our test and production environments. In test everything works as expected, but in production nothing changes. What can I do to enforce the change?

Steps taken:

1. In registry, navigate to the key [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office Server\14.0\Search\Global\Gathering Manager]
2. Change the hexadecimal value for EnableOptimisticTitleOverride to 0 (zero) on the right hand side.
3. Restart SharePoint Search service by typing the following commands in command prompt.
   net stop osearch14
   net start osearch14
4. Reset index
5. Perform a full crawl

Henning