Since the diamond/niobium run was removed, traffic has dried up. Good routes are through Omega 7/3 but thats a risky proposition. There are a few routes to Kusari, not brilliant yields but they are there. There are probably more to Liberty and vice versa.
The war may not have been such a brilliant idea for system population and trade.
I'm sure with the military numbers the RM and Libertonians have, it seemed like a great idea at the time but traders probably just can't be bothered with the hassle. Hamburg/Texas are bottle necks where it's easy to catch blockade runners. If traders can't be bothered, the traffic dies. If that dies, theres fewer pirates because theres less reward. Fewer pirates and smugglers mean less reason for border patrols and anti-pirate excercises, including bounty hunters and the like.
In the end, all thats left is the war between the Rheinland and Liberty militarys which only they will turn up for, while the interest lasts.
I would suggest increasing profits for runs between Kusari and Rheinland a small percentage to encourage routes from New Berlin through Frankfurt and Sigma 13 into Kusari and vice versa. Afterall, theres a war on!
Prices should rise as imports that once came from Liberty now come from Kusari and from Bretonia to Kusari, now come from Rheinland.
That should get activity going for the Blood Dragons again and Bundschuh.
Make the run from Bretonia to Rheinland a little shorter or more way stations along the run for protection for traders.
While your at it. Look at the commodity list for Munich. Try to make it a little more apealing possibly?
Oh...and shrink the system. About 20%.