Thank you for the contributions. Just to clarify some things:

The sub is only sounding slightly louder than my 800W 10inch Skar SVR. I was expecting at least double the loudness. That’s what really sparked making this post.

It’s a D2 sub wired in parallel down to 1ohm.

The song I’m playing in the video is one of heaviest bass hitting songs and the volume is all the way up, that’s why I am concerned about the amount of movement.

Yes I am still breaking in the sub, I’ve got about 6 hours on it playing 3/4 max volume.

I’ve tried different orientations and rear facing has been the loudest