Default bad gsm signal moto xt912

I use the phone on gsm network no 3g or LTE
The problem the signal is very low in cm11 26 nightly
The stock rom. No problem with it at all
If you think the problem with this build . what is the best build for daily use

Thank you in advance
Nexus 7 LTE.... Multi-boot Stock 4.4.2 and CM11 4.4.2 by bruce2728

TWRP recovery 4 all Devices

G Note 3.. Stock Rooted with Xposed framework

Nexus 5 Carbon Rom