How can I decrease the ringtone/notification volume on my Oppo Find 7?
Alright, I've figured out that you can do this by rooting and editing the system table in settings.db (/data/data/com/android.providers.settings/databases).  I used SQLite Editor for this.

I am not completely certain which of the two did the trick, but I edited both volume_system and volume_notification and now my texts are a reasonable volume.