All nations and all ports are like this at times, it's more of a case of Nation vs Nation, it's a large game with a large map I'm at Zoutman and I constantly fight the Spanish and barely see any British etc (due to it being near a large amount of Spanish Ports), I was getting ganked in my lynx early on in my Dutch capital but a lot of that also took place from Ai where once I got an idea of what I was doing was easy to avoid,
As i'm getting larger ships i'm noticing we just need is a degree of respect between players, if you are with or have a Ship of the line, expect it to gain some interest and get a good fleet going or rally the local players to fight back.