Allies are more powerfull in the early game, but Axis in the late game.
This "struggle" kinda rapidly switches side.
The Early game often decides the late game, and what you say about axis late game is not true since the arrival of Brits. Or the buffs to flame weaponry (KV8) Or the buffs to allied infantry scaling (rifles particularly).
Also, have you tried bunkering down with 2x/2x Leigs in 2v2s? Its a ludicrous strategy that doesnt have any real counter other than building the US pack howie.
Yep. Theyre annoying and overperforming. However the allies dont really have much issue countering it. (or at least shouldn't).
+ Balance should be centered around 1v1. Not 2v2.