Once you've completed or quit the drills and are in shootaround stand near a teammate and hold L2+R2 to start a beat the pro custom spot drill. Instantly press start/options and end the drill.
You will receive a +1 to a hidden stat every 3 times you start and exit beat the pro.

I can confirm I got ~60 +1's in a single practice session. just keep repeating til maxed out
Happy Grinding

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