Wasn t the torpedo at Ark Royal set at a deeper depth and struck her while she was turning thereby not hitting the TDS,and taking out her internal communications.......basically three strikes and you're out bad luck.
From what i understand Ark Royal was hit below the TD system as she was turning.The rest were all WW1 designs or small carriers.
Illustrious class elevators weren t armored and most of the hits missed the hanger armor. Good damage control and being anal about avgas probably had a significant...