Basically a experienced player knows about the T11 system when the engine creates the competitions, but ofc. if you face equal or higher quality teams you will need to make more decisions, because with an AvQ advantadge over some competitors or training the players, may not be enough.
Work to get the best performance in all areas -FKs-Corners included-, read the scenario during live matches, get rid of players that have a low contribution despite of thousands of greens invested, is a need.