As discussed, I changed the tactic to positive - had some good results initially but then struggled with Celtic, Chelsea, Liverpool and Leeds.
So after the Leeds result, I changed the formation slightly, by putting the BBM to a BWM in a diamond formation along with the IWB as "Attack" with attacking mentality. Went unbeaten for the rest of the schedule (apart from the 5-3 loss to salzburg, but that was due to 4 injuries and 2 red cards in the game and 3 goals was still good enough to get through to the next round).
I only signed Gareth Bale and Goncalo Guedes during the january transfer, however, we conceded a lot of goals so you need faster wingbacks, defenders.