You can always just kill -HUP so you don’t have to mess with the config files and startups. That forces a cache purge as well.
Does entering the actual plex info actually help?
Yes, it helps in the sense that it scales the amount of workers when it detects something being played in Plex.
Now that I have the latest beta 1.41 installed on the Linux VM running under VMware Fusion under MacOS that I use for PMS I don’t have any problems with the cache not updating in a timely manner. Prior to that I found the quickest & simplest way was just to restart the VM which only takes about 30 seconds.