I have 4.4.2 and noticed that most time my phone stays on G. I've tried also the option to stay in memory but still I may use internet connection for over 30 seconds and still stay on G. If i disable the module and reboot, I have 3G or H all the time at the same location.
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Samsung Galaxy S4 [I9505]
Omega v24 JB 4.4.2 - XXUFNB9
Bootloader: XXUFNB9 (KNOX: 0x1)
XXUFNB9(GSM) - XXUFNB9(LTE)
PhilZ Touch 6.19.6