Insufficient space on Android 6 with SD-Card mouted as internal storage
The correct way to do this is navigate to 

Settings -> Apps -> select a large app -> Storage 

Here it appears some apps have the option to Change the storage, while others do not - developers have to implement this.

If you have a Change button, then a menu appears where you can select the SD card and transfer the app.

I fear you'll have to go through all your large apps manually and try to free up space.

Another option would be to delete the cache of the apps on your internal storage.



Here you can read about how Android deals with adoptable storage.