I have to agree with Hikers post of 28 may which says it best.
Tired, don't blame Airbus for the difference in the FCOM. Each manual is produced for that particular airline and every Chief Pilot thinks he knows more than the manufacturer. This has been going on for years and for me is very frustrating. I tend to lean towards the manufacturers recomendations. After all they designed, built, flight tested, certified, and wrote manuals for the 'plane. Who then should know more about its operation? The Chief Pilot or the people who built it??????? There are just too many ways to operate the same airplane, which is CRAP !!! I think the FAA's, DOT's, & MOT's of this world should put a stop to that nonsense.