After FCP crashes it's best practice to delete the preferences, and is an easy thing to try first whenever there are weird problems. Apologies if you said you reset prefs in the other thread--it's too long for me to keep track of who's done what. To delete FCP prefs, hold down option and command when launching FCP and choose Delete Preferences. It will open the default Untitled library. Open the library you were working on, set the prefs back to the way you like (disable background rendering, etc.) and see if things have improved.
You have Chrome installed which is a known potential culprit for ProApp misbehavior. It installs keystone daemons which are background tasks that alway run whether or not Chrome is open and appear to interfere with the low level video subsystem. See https://chromeisbad.com for instructions on how to completely remove Chrome and the keystone daemons. Just trashing the app isn't enough. I believe the consensus here is to reinstall FCP after removing Chrome. (Drag FCP to the trash but don't empty. Go to the App Store and re-download.)
Is the Promise driver current? I'm not familiar with it but it says it's built using the 10.12 SDK which seems kinda old.
The 12TB drive is getting pretty full.
Others may chime in with advice or things they see in the report.