Here's a secret: You're not going to get any free space out of deleting stock apps from the home screen. The app doesn't get deleted from storage, it just stops it from clogging up the home screen.
Some of the stock apps (podcasts I'm looking at you) were caching a bunch of data you couldn't get rid of. By "hiding" them it does remove the app data to an extent. I recovered 1.2 GB from deleting the podcast app and reinstalling.