You could try making a backup of your current state, flashing to stock/removing mods and ota/kies update. Then flash the update again. If you don't like it u can just restore ur phone back to before all these steps.
I just did the same for upgrading to stock kit kat from stock 4.3 with custom kernel as the kit kat for my country was released several days ago.
Sent from my GT-N7105/Stock 4.42/AGNi Kernel using XDA Free App