I experienced the same thing yesterday in my CL game. My opponent (Q23.1) played a 4-4-2 N-diamond, so I (Q40.3) went on the 4-5-1 V formation and tried to exploit the flanks as much as possible. But despite that, It took me almost 70min before I could break him down and win with 5 - 0.
Also, my opponents seems to get more bookings and playing one man short the last 10 to 5 minutes. Dont know if it´s because they play hard or defensive, or just "coincidence".