Question [Q] Android 4.4.2 radio modem problem (WIND Operator in Italy)

I've just installed android 4.4.2 (after 4.4.1 update), and i noted a low phone signal with the new radio modem (same with the android 4.4.1 one, i think they are the same). Is it normal that the new radio modem in worse that the first one? I'm from Italy with WIND operator. I saw also dbm and asu numbers, and i can see with the new modem they are worse. I instaled the first modem so...