[surjones]

Okay here is this is as close to a 95% resolution that you (the person reading this, who has the same issue) will get!

Start your machine in Recovery Mode - (make sure you have backups of files first) Enter recovery mode by: Restarting and holding CMD+R

Open Disc Utilities
Delete extra volumes
I had one that was greyed out - I started with that one.
After that was done, I rebooted and checked and I have now 405gb of FREE SPACE!

I hope that this helps whoever is reading this.