I’m with CWO Marc here – I think at the point where you are trying to run a balanced March 1943 scenario, you’re not talking about a few minor revisions to history for game balance; you’re talking about totally re-writing history. Which is fine, if that’s what you want to do, but you’ll have to be bolder about your edits.
It’s a little hard for me to read your scenario setup from a wall of text; a graphic or illustration of some kind would be helpful. I apologize for any mistakes I may have made in interpreting your scenario. That said, the problem with your scenario, as I see it, is that there is no credible Axis path to victory. The Axis have to simply wait around and hope the Allies make a mistake. Maybe the Germans can press on to Moscow and get lucky there, but they have no time to build up additional reserves, no way to wear down the Russian economy, and no ability to threaten London, so there aren’t really any strategic choices to be made – just march every man east to Moscow, and hope you get lucky. Similarly, Japan is earning much less than the USA, is not in position to do devastating damage to the US Navy, and is not in position to capture enough of China, Siberia, or ANZAC in time to achieve parity against the US. They can fight over the Dutch East Indies but not hold them, which means that’s a losing strategy for Japan, because it will cost them more in lost transports and destroyers than they earn by holding the islands. Maybe Japan can get lucky against India, but, again, Japan has no real options in this scenario – they have to just send every man west and hope they roll well.
So, if you want a balanced March 1943 scenario, consider some or all of the following changes:
Germany controls and can hold Leningrad
German battles in Stalingrad were inconclusive; Germany still has significant forces in Rostov and Caucasus
Britain lost the Second Battle of El Alamein, resulting in Italian control of Alexandria and Cairo; British forces are defending in Sudan and Trans-Jordan
Italian navy was warned of the Taranto raid, and so more Italian navy survives, maintaining local naval superiority for now in the central Med
America was slow to recover from Kasserine Pass, and holds Morocco but not Algeria
Japan won a bloody victory at the battle of Midway, and so Japan currently has four carriers to America’s two, as well as control of Midway, Wake, and the Aleutian islands
Japan won the battle of Guadalcanal, and so Japan currently has control of the Solomon Islands and both territories in New Guinea
The goal of these changes would be to give the Axis additional (any?) strategic options so that the Axis have multiple credible long-term paths to victory and feel like they are somewhat in control of their destiny, instead of just serving as a punching bag for the incoming Allied invasions. I like the idea of a balanced 1943 scenario very much, but you’re not going to get there by starting with historical 1943 borders and tweaking the unit counts a bit. Contrary to popular belief, the war was lost for the Axis by March 1943; after the Axis failed to knock any of their opponents out of the war and the Allies secured naval lines of supply to France, Africa, and Indonesia, an Axis defeat was just a matter of time. This dynamic, unfortunately, will be well-captured by OOB A&A rules, and will result in your Axis side getting defeated 19 out of 20 games unless you make drastic edits.