My gaming circle does not feel Axis and Allies WWI is balanced. None of us has yet achieved victory as the Central Powers. What rule modifications would you suggest to balance the game?
I would make the following observation, that there are THREE blocs (not two). They are: Central Powers, Germany, Austria-Hungary, Ottoman Empire, 77 IPCs; Western Entente, Britain and France, 54 IPCs; "fence sitters," U.S., Russia, and Italy 59 IPCs, in total. Although aligned with the Entente, the fence sitters basically had the balance of power. So game "fixes," might be addressed at them.
Russia: Make it easier for the Central Powers to start the Russian Revolution and knock Russia out of the war. That eliminates Russia's 25 IPCs. Also, the Central powers get to keep Eastern Europe and the Ukraine with their IPCs.
U.S. It's not a given that the U.S. joins the war. One might make a rule that beginning with turn 3, the Western Entente gets an "allowance" of 10 (out of 20) U.S. IPCs per turn, delivered to the UK. The Central Powers can permit this, or else they can "interdict" those IPCs, by declaring unrestricted submarine warfare. Beginning with the turn on which "interdiction" occurs, the U.S. player may join the war on any turn when in rolls a six, but it can build units only U.S. territory. Sensible Central Powers players would probably opt for the 10 IPC allowance.
Italy: Force both sides to "bid" for Italy's services, using IPCs. The Central powers had the advantage, insofar as they bid for Italy (in real life) using Austrian territory. The Western powers can do the same, but if they don't "pay off" by controlling those territories at the end of 10 turns, Italy joins the Central powers. In any event, Italy leaves the war after 10 turns.
The "fence sitters can win if their IPCS of 20 (U.S)+ Russia (25, minus Central power occoupied territories)+ Italy (14IPCs, plus territories handed over in the bidding war) exceed that of both the Allies and Central Powers.