No turn the late updates off on the controllers themselves, also DOES it mess with their game thread values? You said that the hands were VISIBLY shaking, I would assume that if the game thread values were off that the scaling would shake as well.
Because that would be an entirely different thing.
Edit Just saw you say that the scaling goes back and forth…mmmm
Are you using the simple character? The code base is the exact same for the controllers between epics and mine EXCEPT for when using a simple character as I have to pull back the controllers in that case.