changing the commodity values could solve the problem there, but wouldnt do much for the cardamine/slave run that goes through alaska and omicron 100.
It makes sense as well that commodity values would change over time, I think kyushu has plenty of diamonds and rheinland has plenty of niobium now. Let's drop those prices and make something else valuable.
I really think a 'high profit' route needs to be added that goes somewhere through bretonia, it'd really liven up an otherwise 'dead' area.
Some smuggling routes should also be added between kusari and bretonia for both sides - running the 'blockades' to get resources to one side or the other and help their war effort.