Glad you like it! What triggers the new TCs when using the address bar is the Global Isolation. Automatic Mode creates new TCs primarily when opening new tabs.

If your goal is to have containers for specific domains, you might want to look into extensions managing permanent containers, like Multi-Account Containers (https://addons.mozilla.org/firefox/addon/multi-account-containers/). TC is meant to always create fresh temporary containers and not re-using existing containers. If you really think that should be a thing feel free to open an issue over on GitHub (https://github.com/stoically/temporary-containers/issues).