Here are a few things for you to check in Settings:
1) Under the Privacy & Safety heading, check that the option to "Send Diagnostic Info" is switched off.
2) Under Google, press the upper right corner overflow menu,
Ensure that this option is switched off.
3) Ensure that Google Location History is also switched to off, this can be found under your location settings.
4) Check the "optimize apps" for battery life under the battery life tab, try turning it on and off and compare the drain you experience. Some have reported reduced drain with the feature turned off.
5) Try turning off Google Back Up under the Back Up tab in Settings.
6) Clear the device cache using the recovery. With the Device Off, press the Home Button, Power Button and Volume Up simulatenously to access recovery.
If the above do not provide any noticeable results, I would suggest doing a factory reset and reinstalling apps slowly from the beginning. Although the July software build is inherently flawed and great battery life is not to be expected. I noticed a reduction in Android System drain after doing a factory reset but it always depends. After enough testing I can confidently say that the Android system drain is 100% associated with these botched software builds as my S7E was optimized for my usage perfectly from the get go and the only changes were these updates which resulted in the horrific battery drain.