The balance team are hamstrung. Relic won't let them make some (very necessary) major changes to the faction, they seem to be doing their best to make UKF a real faction while staying within the confines of Relic's autistic "vision".
Unfortunately it isnt working, though the effort really is commendable.
While they may be constrained on some things, the direction of the last several patches has been to worsen allies in 4v4. I realize that they're trying to balance 1v1 and possibly 2v2 more than they're trying to affect 4v4's, but they aren't really trying to even out 4v4's.
The statistics aren't surprising. The non-doc rocket arty has too great of an impact on 4v4's, where both werfers and stukas delete allied infantry really well.
UKF doesn't have a good arty counter. They have only three abilities that delete howitzers, each in a single doctrine. Two of them are really expensive and have long cooldowns (Supremacy and Concentrated Fire). The one with Advanced Emplacements is okay but the rest of the doctrine isn't good in 4v4's. The change to Advanced Emplacements was a step in the right direction, but Improved Fortification will always make emplacements more difficult to balance. It would be much better to replace that ability with a 25lbr howitzer to make the commander similar to the Storm commander.
There doesn't really seem to be any good options for USF besides Airborne, Infantry, and Urban (or possibly tactical). The nerf to IR made Recon even more irrelevant. The tiny buff to the Greyhound leaves it still irrelevant. Buffing the main gun or giving it something like treadbreaker would go a long way towards making it better. USF badly needs a non-doc damage sponge. Ost always has at least a Panther and a Brummbar, OKW always has KT's, Panthers, and a PIV that is better than a Sherman. USF has to crutch on Jacksons, Calliope's, Priests, and skill planes.
I think Soviets are mostly okay at the moment. Their win rate is most likely dragged down by UKF.
In the smaller game modes, I think OKW struggles on some of the maps because of the weird power curve of Volks. They probably should be a little better late game. Instead of more Con nerfs, there should be some Volks buffs. I usually get 2-3 Volks in 4's but never replace them if I lose them, they're just too mediocre at the end of the game, especially compared to every other option.