Okay so now that I see when you're on CM10.1 its the same low service. Its not the RIL files. Its actually AT&T lying to you. I know this because whenever I go to Rangely Co, I have crappy service on cm10.1. When on stock ROM I see all bars and 4G, yet speeds are almost nonexistent and I can hardly ever get a phone call out
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Future Phone: LG Google Nexus 5
Current Phones: Samsung Galaxy Note 3 AT&T[Rooted], LG Optimus G Pro AT&T[Liquid Smooth]
Past: LG Optimus G AT&T, LG Google Nexus 4, Samsung Galaxy S3 AT&T, Samsung GS2 AT&T, Sony Xperia ion AT&T, Samsung Infuse AT&T(First Android Phone), All iPhones before that.