hi everyone,
i think port bonus is killing small clans and RvR too.
imo a possible solution could be: give each port a specialization as it once was, perhaps upgradeable and implementable with some small bonuses that work like the current port bonuses.
ex Vera Cruz produce very hard ship; you can invest CM, doublons and VM to upgrade the bonus and you can upgrade also other minor bonus( for example the pushing of the square or thickness and hp of the masts or the refilling of the guns).
each of these bonus should raise or lower the crafting cost of the ship.
all the nation can use this bonus or not, in the crafting windows there should be the option to use or not the bonus.