@larry767 - No, I get it! The issue is you messed up the Fusion Drive as you took away the HDD the cache was bonded to. The system got into a battle between the cache drive trying to impose its role when your new SSD is also trying to grab attention too!
Apple now requires full removal of there cache drive. I often slide in an OWC blade SSD. Setting it up as a dual dive config with the blade as the boot drive for advanced amateurs, pro’s and students which are in the Arts all three in music & video work.