Regarding Germanys abysmal win/loss ratio in ground RB

So I saw that Germany has abysmal win/loss which surprised me since I remembered that I would have quite easy games as Germany personally.
So I decided to try my 5.7 and 6.7 lineups.

Roughly 30 games later I had full uptiers in all 30 games. Did they change matchmaker? And it’s regardles if I play 5.7 or 6.7

What is going on? Back in the days it would be roughly 50/50 for uptiers.
Is there something wrong with my lineup?

6.7 and 7.7 have strong line ups in some nations which causes it. you will have more uptiers in general since the top tier player slots are limited.

Some nations have stronger setup than others (that’s why same vehicle can have different br in different TT). USA and Soviet 6.7-7.7 setup would be strongest there

German players suck

No other reason

For the past two weeks, I’ve been playing the USSR at BR 6.3–7.0, and I have the same impression about Soviet players. Whether I’m teamed up with Germany or fighting against Germany, we keep getting steamrolled and most battles end in defeat.
Previously, when I was playing Germany at BR 6.0–6.7 against the USSR, most battles were a struggle and often ended in losses. Whenever the USSR was on my team, however, matches generally went better and we won more often.