If you used stock (rooted/not-rooted and xposed/non-xposed) you should be fine and there should not be a FC. Some flashable addons could cause this I would suspect.
Xposed should run fine. It could be the activated modules. Try disabling all modules, reboot and check if it fixes the problem. The compatibility of Xposed modules on 4.4 got way worse. Gravitybox ran fine with 95% of the options on 4.3 and with 4.4 it is almost unusable for example.
I am not sure if you would restore the Kernel baseband etc. Just to be sure I would restore the TWRP backup, power the phone off and flash the stripped FTF from 101 again. If you don't have a stripped FTF, I uploaded it sometime ago: http://d-h.st/wUs but be careful to not wipe your data with it, I did not remove the option to wipe appslog/cache/data so you have to uncheck this manually.
I fixed some of the high battery drain by "Wakelock Terminator" in the Play Store and disabling/spoofing the NlpWakeLock and NlpCollectorWakeLock. It seems to be a like shady app/dev though which is extra dangerous with xposed (it can do everything, even without permissions thanks to superuser access) - the app asks you if you love it and if you do you can give a play store rating if not a chat will be opened to submit you problems/feature requests, but the dev does not answer. Also the ratings speak for itself.
Problem solved by disabling all Xposed modules. Yes apparently there are some uncompatible modules with KK. I have installed wakelock detector, is it the same function with wakelock terminator?
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