Default [Q] On NC2, need to return to stock

I am running NC2 and have had terrible reception issues. I have flashed to NC4 modem and it didn't help at all... If anything it is worse. I am considering flashing back to stock and doing a warranty replacement due to the issue.

Question is... Which way should I go? Flash back to mje or up to NC4? Does it matter? If NC4 makes the most sense, can I Odin straight to it or do I need to go back to mje and take the OTA? Will Samsung or vzw care of I return the phone for reception issues and it's not on the latest version?
Galaxy Note 3 - 4.4.2 -|- Nexus 7 2013 Stock | Galaxy Nexus PA 3.68 | Acer Icona A500 CM 10.1 unofficial | OG Droid CM7.2