I tried to read the minidump files with some viewer I found. I opened 5 different dumps, and all of them had a different error listed as the reason for the crash. I guess that is a dead end. Or maybe I just don't know what I'm supposed to be looking for in those dumps.

I have uninstalled the 11.5 drivers and installed 11.6 now. Going to try running phoenix with the modified kernel and see if it works better this time. Going to leave it at stock settings and see if it still runs tomorrow morning.