Elric of Melniboné

Hello and thanks in advance for your technical support. I'm italian and I'm playing the game in my own language for a better immersion, that's why I ask you to excuse my poor english. The problem is I can't complete the quest because the leader of the Doemenels (the faction I choosed) won't speak to me after he realized I accepted the Winds of Steel quest from the Knights' faction (That's my hypothesis, but I'm not sure). I tried to kill a few NPCs from the Crucible so the Leader would have been happier if I had a "bad" standing with the opposite faction. I REALLY regret doing that, because I'm RPing as much as possible in this game. I read on the forums that I can always kill members from EVERY faction so that Lady Webb allows me to choose another questpath, but I'd avoid that if possible. Right now I'm stuck and and I'm unable to fix things because the Knights are attacking me on sight and the Doemenel's leader always shows up the same old dialogues. Any help would be very appreciated since I spent 50+ hours already on this playthrough