In reply to Thickoatmeal
Well, it seems there's a bug, both Splash Sensitivity and Bobber Density values shouldn't be closed. Have you changed "Looking For Bobber Direction"? It should be reversed for Vanilla(splash) settings: the bot finds the left-most bottom-most position on the bobber and from that it detects whiteness of the splash, that's why it's important to be reversed. Will fix that bug I talked about and increasing sensitivity value might help (it's the size of the area where bot detects splash animation), because you use blue feather and it's a little bit further from the splash animation. Also decreasing splash color should help. I know it's kinda funny, but for some reason (or on purpuse) private vanilla servers use unfinished animations of the bobber plunging and it's quite hard to detect. Also, have you tried sound detection?