I've read here before that the Outfield Fielding Errors has an impact on the success rate of dives.
I don't know if that's just for auto/CPU fielding or if it impacts user input.
Wild pitches - in the past, I've read infield fielding error slider has something to do with it. And, supposedly, pitch consistency slider (the one that lowers HBP, WP, and "Far off target" pitches, supposedly).
I don't know how true it was or is now in MLB18. Just throwing out what I remember reading in the past in case you want to give it a try.