I would recommend not to use the packet disabler, it has no effect from my experience. It gets worse actually. Nougat is very aggressively optimizing apps by itself, I had to manually remove the email program from optimization to get the emails when the phone was idle. The idle battery life is good without using optimization programs, just play with the existing one and optimize programs which could draw battery when you do not use the phone. It will do that automatically if you do not disable optimization for some programs.