After hours of searching, I finally decided to patch the diag drivers to include the HTC Zara (Desire 601). Any of you with the CDMA version may want to play with radio settings, etc.
To use this, unzip the file. Then, in an adb shell, type:
su echo 1 > /sys/devices/virtual/android_usb/android0/f_diag/on
It looks like a lot of settings are locked down now, so either a CDMA WS update will fix it, or someone with far more knowledge than me will have to actually patch the radio.
Credit to XDA User twistedumbrella for the adb shell command.