Water Breathing Items: Manual vs. Game

[Stryke11]

Hey all, sorry if this has been mentioned before, but in the manual it says that the Sea King's goblet gives Water Breathing to 100 troops, but in the game it only gives it to 50. Also, the Barrel of Air says 150 troops in the manual, but only 75 in the game. I am currently mounting an extremely difficult assault on Oceania who has kelp forts up in every costal province and I wish the manual numbers were the correct ones. I'm just wondering if there is some reason for this besides a manual error. Like maybe I'm doing something wrong, or have some element incorrect.

Thanks!