Thank you for your continued help. Here is what I found:
sql_patch_ref greatest value is 319
1) Confirmed database settings are the same in config/custom.config.ini as my last 2 config files (2019.2, 2011.1)
2) Deleted contents of php.log, no content added to file after trying to access SI and clicking through the loop a couple times.
3) Attached si.log below. Order of my entries: entered SI root in address bar, clicked on install essential data, clicked on start using SI