I've learned that a USB Z-Wave Stick is C7's best friend to purge those ghosts!
There are many types of Z-Wave sticks out there, with various costs & functions. I purchased the Aeotec Z-Stick Gen5 Plus UZB, and it works with Windows based PC Controller software. I load VMWare Fusion/Windows 10 on the MacBook Pro and have a secondary controller to cleanup the Z-Wave database when it gets stuck.