Quick update: Won 4:0 in the 2nd leg (away) match!
We were both absent. I played my usual 3N-2W-2N-2W-1 (butterfly) formation and used the tactics proposed by Nik (defensive & counters etc.). Although I think the opposing manager forgot to place his best players because there were a few better players on the bench. He did put them only afterwards in his main formation. Probably I was lucky.
So thank you Nik for your advice! I surely will try the other formation (3DC-1DMC-ML-2MC-MR-AMC-ST) you've proposed whenever I think it could be helpful.
Best,
Nidd
Edit: The opposing manager (99% strength vs my ~ 114%) in the upcoming finals does play 4-4-1-1. Have to think about my counter.