I never had a problem with 4.3. I was running hyperdrive 4.3 with greenify, v6 supercharger, and a crap storm of other tweaks and xposed mods and with very little usage (didn't take a screenshot of screen on time) I was at 5 days 13 hours 43 min with 6% battery left. I tried to update to hyperdrive kit kat and had nothing but problems so I flashed stock nc2, upgraded to nc4 modem and have spent the last week (couple hours a night) modifying and tweaking. I'm currently at 1 day 20 hours 13 min with 4 hrs 15 min screen on time and I have 19% battery left. I would probably be closer to 25%-30+% but last night I decided to go all out with the cpu control and run antutu benchmark twice to test different I/o schedulers.
Samsung Note 3 - Xposed modified Kit Kat NC4
Samsung GT-I815 - PAC-man 23.0.0