As in you are directly attaching another actor to the motion controllers themselves? I would check the tick order in that case, if the controllers are ticking before / after the child actors it can cause different behavior. Child COMPONENTS are auto set to tick after their parent components so that they get the correct location when they update their position.
I haven’t looked at how they handle child actors and tick ordering, regardless attached actors shouldn’t be “faster”. I don’t know what your setup is.
If you mean rescale them on grip, pass in a different scale in the transform you give it. If you mean rescale in the world…set the actors scale.