To anyone that may have had data issues running the gpe roms.
Disable the quick settings that gravity box uses and see if that helps. I have noticed that when they are enabled my data is sketchy and doesn't report as accurately. Once I disabled them and rebooted it is much better.
I'm still having the issue in a clean slate. Data will wildy change from 1 bar to 3 to 4 then back to 0. All in a span of 5-10 seconds. Other times I have 1x only r only voice service. Meanwhile my wife's phone is just fine and stable. (She has iPhone though)
Sent from my HTC One using XDA Premium 4 mobile app