Hi Justin,
You could start by sharing the patch with the modifications you mention, in gerrit or here.
Quick look at the log I see: "UHDDevice.cpp:250 No Power parameters exist for device UmTRX 4/1 Tx/Rx SPS on band GSM900, using B210 ones as fallback"
hence line 250, which is the current line in master. So not sure if you are really running the modified version, since I'd expect that line to be higher if you added entries to the dev_band_nom_power_param_map table.
Regards, Pau