Silly question but have you set the draw debug type to something like one frame and verified that the line trace is not doing what you want? Have you attempted to print out what the aimposition is? Does it look reasonable relative to the world location of the actual motion controller?
Barring that, I would say rather than using the “get motion controller data” just use the actual motion controller component…hook it up just like you have it by using the world location as the start and multiplying the forward vector by some distance for the end. I’ve had issues in the past using “get motion controller data”. It’s unclear that is available for all setups.