When a nation wins a server victory it changes the number of bonus points they get next time around. In addition, the nations that came in 3rd and 4th (in point totals) receive 10 and 20 additional points respectively. I believe this explains the current bonus points on Blackbeard.
I'll bring up the possibility of making ports continue to count for the defender until the port battle. Nothing about it immediately strikes me as bad, but I could be missing something.
Our expectation is that the Pirate conquest experience is significantly different from the national conquest experience. I am willing to believe that it is currently too difficult for Pirates to win a server victory. I definitely feel that the high level Pirate experience is not where we want it to be. We're discussing ways of addressing that. Increased points for raided ports are certainly a possibility. Increased bonus points for Pirates is possible but unlikely. We're exploring other possibilities.