Does Portugal or Germany own Cabinda? I've seen it depicted different ways on a number of maps.
Also, Belgium probably has a tougher time holding onto the Congo than OTL, given the apparent lack of Katanga (which was by a large margin, the most profitable region of the Congo, and had the lowest population). The best-case solution for Belgium is probably to partition off South Kassai (the next wealthiest region), and retain a large degree of influence there. The remainder of the Congo should be split, roughly east-west, into two nations, so neither is strong enough to annex Belgium-supported South Kassai.
During the scramble for Africa Cabinda was origianlly claimed by Napoleon IV. After the great war Cabinda is given to Germany as part of German Cameroon.
Good points on the Congo.