I really struggling with the damage blocked missions, especially with Germany. E100 definitely not possible. I failed with various Tier 8s as well. Mostly they did not shoot, or spam HE on heavily armoured German tanks.
I look for the best one possible. I have countless blueprints and more free XP than I can do something with. So I can unlock any tank in the line.
So the best German tank to blocking is? 😉