I created a App using vuforia unity extension.
When augmenting an 3d object much larger than the size of the image, the augmented object shakes tremendously.
When the image is located at the top or bottom of the model and it is augmented more than 5 times in one direction of the image, the shaking becomes large
Registered images receive five stars from the vuforia site.
Check the situation.
I will send you detailed development environment by mail.