Just dropping by and I felt like I could give you some hints about potential causes of battery drain.
From my experience, I figured out that the only reasons when I experience higher drainage is soft-rebooting a device.
This is not GB related and can easily happen without running any xposed modules.
It seems like when doing soft reboot, the device is not initialized properly in some parts which can cause some unexpected behavior resulting in higher battery consumption.
The recommendation: avoid using soft-reboots as much as possible. Use normal reboot instead. It doesn't take a lot more time for the device to boot compared to soft-reboot, anyway.
running stock KitKat + GravityBox
GravityBox app - Xposed module for devices running vanilla Android
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