But I have use those tactics in classic mode and they don't seem to have the same impact. I think classic mode is diff to normal career mode.
Its the exact same match engine.The difference is that in Classic Mode ( FMC), you dont have the same influence over the man management. In short, you are playing a much, much more simplified version of the game.
As an example: Lets say you are using a high energy game with lots of pressing(like allmost all plug & plat tactics have). Here, its hugely important that ALL players are motivated and not complacent so the while team works as a unit. IN the the full game, you have more influence over this( and if being a poor manager, you will therefor not get results) whilst in the FMC, you are left to trust that things sort them out them selfes ( meaning that this high energy game might not work at all at times)