If there are no equally profitable routes compared to the NB to NT or Kyushu..make some.
If there are equally profitable routes that involve more of Sirus...post em.
People are right in saying it is now a very profitable area so a ton of traders are always there as well as a ton pirates to pirate those traders and a ton police/security/navy to fight the pirates.
It is not so much the JH that is causing the imbalance as the trade route.
Honestly I am just lazy. If folks want to tell or make a good route that takes me through libery and bretonia I'd be happy to start doing that. And if lot of folks also started doing that route we would see more pirates there which might make me feel like making a Bretonian character.