It is far too easy for G to shove nearly 10 armor a turn into russia while Italy plays can opener and defends France when the US goes pacific. There is no way to keep G from all 3 NOs without UK/US aid once you have to defend moscow from the can opener, and at that time G is making far too much money. Europe is where the underlying problem is, without significant US aid you cannot keep germany in check, and even going all out pacific you cannot keep japan in check, so we are left with attacking the closer threat, germany. Also, you go where the money is, going against japan will net the UK a few extra bucks and the US one more NO. But going all out against G will net you a 10 IPC russian NO, plus when you take france that makes up for the cash you loose in the pacific, as well as finland/norway and the territories you are trading like Poland or NWE. In my typical KGF games russia is making 40+ by turn 4 on average, UK is back up near 40, and US stays at nearly 50, while germany and italy struggle just to keep 1 NO combined around turn 4. If I go pacific my income is no where near that nice!
As far as splitting the US between pacific/atlantic, that is foolish as well. It will take you several turns before your even a threat to Japan and by then she is making her 70 IPC anyway with the factories up and running and your still fighting to keep your 2nd pacific NO as US as you bet i’ll sac a trannie or two for the steal. All Japan needs to do is keep her starting carriers, build some figs and sprinkle in a few subs if you get too large, with 3 starting carriers she can drop 12 figs on you typically with good positioning, and she usually has around 8 left after turn 1 to start!