I have installed Xposed and I can’t complain. I am happy to have Xposed.
However, I do not have GravityBox. This sentence, which I found in the description page of the GravityBox(N) module refrained me from installing GravityBox: “SHOULD NOT be used with custom ROMs like Lineage, AOSPA, or any other derivative- it makes no sense since most of the features are already in the ROM (may cause conflicts and unexpected behavior)”
The modules I use so far:
FakeGapps (for microg: I could not patch the signature with Tingle, so that is why I use this module, for signature spoofing)
RootCloak ( works fine so far)
This App will Run Without Google Play Services (for the App from my local football team)
Regarding battery life, I did not notice any difference. Battery life has been pretty poor ever since I started using Lineage. I have gotten used to it. I do not use Greenify. I have never been a fan of it.
Hope these lines are of help…
Have a beautiful day!