Eureka!!! I have broken the code at last. You are not a Westie but a Cessna 150 driver who is merely posting in solidarity with that group.
The Madrid flight is handled by an A330, not an A320, just to be clear. The QRH landing distance calculations are based on manual braking so as to be fully within safe operating limits in the event of a failure or malfunction of the autobrakes. This is an entirely separate issue from the question of what method of braking should be used during this abnormal procedure. The manuals and common sense are fully in agreement on this one. Autobrakes are to be used.
It was a nice ruse while it lasted. I congratulate you. What gave it away was that no professional airline pilot would confuse the two issues of landing distance calculation and abnormal operating procedures.
Airline pilot indeed. Good one.