Hey Teemo.
My trainees have OD, ID and SB at least at 10 now. Some of them have a higher OD (14/15) another has higher ID (14).
This season I will go for a second round of SB.
Most of my players have now stamina 8+.
And if you want to run a really effective FCP, you have to play fast offenses, so your offense skills will be an issue too.