Yeah,sometimes when a player played 48 min, he can only keep his GS at 7-8.
If you want make your player to be a higher GS level,55-75 is perfect.
In fact,most of the teams all have 3 trainees or more, so we could only give them 48 min per week.So my tactic can make all these 11 players' GS at 7-9.