I have seen posts recommending 20% free space on your disc. Can you trim your disc to get that?
27" iMac Pro 1.1 8 core 64 GB 1 Tb SSD with 27" Apple Thunderbolt display
MacOS Catalina 10.15.4, Logic X 10.4.8 (10.5 also being investigated/trialed)
4 TB G-RAID via Thunderbolt Display and 4 TB TBolt HDD Timemachine only,
RME UFX via Firewire to Thunderbolt Display,
MOTU MIDI express XT to USB, Seaboard 25 via BT or USB,
Roland AT45, Kurzweil PC2r & PC3X, Arturia MatrixBrute, 12Step & BCF2000 via MOTU’s MIDI
PC3X, MatrixBrute, 12Step and BCF2000 occasionally via USB.