I ended up installing the update coming from the latest T-mobile firmware and excluding the baseband when flashing the tft file. Everything seems to be fine for me, I still get LTE speed only now the icon shows up as "4g" rather than "LTE" but that's fine. Out of curiosity does anyone here use the T-mobile Isis app and if so do you know how I can get it to recognize the phone as the T-mobile variant thus allowing me to use the app? I've tried replacing all instances of "c6603" with "c6606" in the build.prop to make it match the what was there in the original firmware, but I've had no luck.
Ericsson Xperia Neo (MT15a) - LegacyXperia CM11
HP Touchpad (16GB) - Evervolve 4.4.2 nightlies
Sony Xperia Z (c6606) - Stock 4.2.2 FW (rooted)
Nexus 7 (2013) - Stock 4.4.2 (rooted)