I was also running rsl7 hyperdrive fine and decided to switch to rsl8 kit kat and had nothing but problems. Not complaining at all, I don't know how to compile a rom but I didn't feel like troubleshooting anything anymore. I tried using the nc4 modem on 4.3 but battery drain was about double of the mje modem. What I would suggest (if you want kit kat) is flash the pre-rooted stock nc2 (upgrade to nc4 modem if you wish, found I get better reception in the boondocks) and use xposed for all your modding desires. I found using Gravity box, wanam and xblast I could modify and add whatever I wanted without having features I didn't want or need. And with the addition of Apex I have even more control over my phone then what stock hyperdrive offered.
Samsung Note 3 - Xposed modified Kit Kat NC4
Samsung GT-I815 - PAC-man 23.0.0