Sorry my friend, but thats not true!
Before brit came out, 3vs3, 4vs4 Axis were allways stronger!
You had a chance to win with the old forwardhq on some maps and good teamplay.
Back to the topic:
And i agree in thic cup axis could have a good chance to win now. No Vp pressure and no arty cover
With random teams the axis were stronger. In organized play it was the other way around. Superior allied mobility meant that the Germans had to choose between losing by getting isolated and ganked or losing by grouping up and being unable to defend cutoffs/VPs. To be fair, this was only clear at the tippy top of the ladder and in tournaments. Lower down the 90% Axis winrates were real.
Basically 4v4 is/was a complete balancing clusterfuck and I pity the poor bastard who had to try to wrangle it into line. The only real way would be a dramatic flattening of power spikes and especially in the early and late game.