Try to use only 1 type of bombers; either all Tb, or all Db.
Lets say you got 2 Db pilot and 1 Tb pilot, and halfway through the battle, the TB planes runs out. So you've got one pilot sitting there doing nothing, while the Db's have less planes to start off with.
Just so you know in order of bombers ranking
Db => Km>ijn>Usn>UK
Tb => Uk>Usn>Ijn>Km
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