I bumped up fielding errors and started seeing every dive result in a ball bouncing off the glove. Reaction helps them get to the ball, but the fielding errors slider still seems to determine how often they execute the play on the dive. In my experience, anyway.
EDIT: I went into Custom Practice and tried different settings, and now I'm not convinced either slider makes a difference on dives. If they do, it's either very slight, or something about Custom Practice breaks things.
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