The issue was that towards the end of the national cup I had to play against tough teams and I had no choice but to make my players play extra minutes, and that continued for like 3 weeks (plateaus, followed by cows, and then indiens).
In addition to that, three of my players got injured one after another and that reaaally screwed up my players' GS, so I didn't have enough time to restore my players' GS :( If my players' GS had been just a little better I probably could have won...
But thanks a lot for your support :)