Perhaps it is not useful, that is, they do their job well.
My suggestions would be for the galleon to have the ability that other warships have (multiple shot). In addition, she can create troops without the need to go to the shore.
The caravel is fine for me.
Maybe by the end of the game they should have the ‘imperial upgrade’, since we can’t increase the ship limit as it was before with the ‘admiralty’ card.
Maybe the ‘admiralty’ card should reduce the price of warships.