My CB/FS/SS play style grade went from an A+ to an F in one game

I switched from a 6 minute clock to an accelerated 15 minute clock because I felt like that was a better gaming experience but after I finished one game the play style grades went from an A+ to an F. I even had 2 INTs and won the game so I'm curious as to why my secondary's play style grades completely tanked despite playing well. It's caused me to be completely locked out of a couple of recruits and I have no clue how to fix it. Do I have to go back to the 6 minute non accelerated clock or is there something else that can help fix the issue?