Now my allies are Russia, Britain, France, Portugal, Tuscany (who is huge), France, Livonian order and Riga (you'll know why I have so many soon). Lately due to my expansion a coalition formed which has Brandenburg, Sweden, Poland and a smattering of city states still left to the west of Brandenburg.
Within months they are up to 18% from battles alone and Brandenburg keep having these ridiculous 5 6 leaders. The troop numbers are 600k infantry, 400k cavalry and 500k cannons on my side with 380k infantry, 300k cavalry and 300k cannons of their side but nothing is working. I narrowly escaped the first coalition war by ceding my allies land (why is that even an option lel), but the second one has been declared and I can't weasel out again. Their troops just kill everything, and even if I beat them convincingly, I always take 3-1 losses. I don't care about any of my enemies except brandenburg. EVERY fight against the coalition troops ended badly. Even though when the first coalition war was declared we had almost double their troops it just didn't matter. Now my allies are Russia, Britain, Portugal, Tuscany (who is huge), France, Livonian order and Riga (you'll know why I have so many soon). I have a ton of allies, am up to date in military tech and have offensive, quantity and quality. My force limit is 270, I control lower Germany + Hungary and other bits.
Playing as Salzburg on Hard with AI bonuses and it's 1664 or so.