OK so I was able to narrow the problem down.
So, I flashed ICS, calls worked.
Changed APNs still worked no LTE though.
Finally, did the *#2263# and set the LTE band as prefered. Then I rebooted, and I got LTE but lost calling.
So its definitly the band or the apn thats causing this problem. So now its just choose between LTE or calling which sucks.
Hope that helps.
Going to try the UCLD2 roms now, ill report back in a few