It's contextual Brandwin. For these settings, 52 is the thresh I settled on (53 can work too but I prefer 52 as the lineplay is a tad looser and more organic).
The key is not threshold, it is the MM injury slider. With it at 10 by default, it throws everything out of whack in CFM as it unbalances the game engine. It's super hard to describe. But in short, virtually all of the things that seem "off" with this game (CPU RB pathfinding, over the top tackles, overractive animations, out-of-sync blocking, etc.) are greatly minimized.