Finder Plugins (was Launchd Configuration Puzzle)
You could try running EtreCheck on your Mac. It's a diagnostic tool that, amongst other things, will list all the kernel extensions, launch agents, launch daemons, user login items, internet plugins, Safari extensions, etc.

This might find something that you've missed.

Just as an example of the type of output you'll get, here is a partial entry from a scan of my MacBook Pro. It shows that I've removed applications but forgotten to remove the plist files that are still attempting to launch them.