AWR1443BOOST: Adding another antenna to TX1 chirp results in loss of elevation data

Greetings,

I've been messing around with multi-TX settings with my awr1443EVM, specifically interested in implementing BPM. Currently I'm sending the resultant point cloud to a visualizer utility over CAN. Below is my configuration:

dfeDataOutputMode 1
channelCfg 15 7 0
adcCfg 2 1
adcbufCfg 0 1 0 1
profileCfg 0 77 7 7  57.14 0 0 70 1 240 4884 0 0 34
chirpCfg 0 0 0 0 0 0 0 5
chirpCfg 1 1 0 0 0 0 0 6
chirpCfg 2 2 0 0 0 0 0 3
bpmChirpCfg 0 0 2
bpmChirpCfg 1 1 20
bpmChirpCfg 2 2 2
frameCfg 0 2 7 0 50 1 0
lowPower 0 1
guiMonitor 1 1 0 0 0 1
cfarCfg 0 2 8 4 3 0 1280
peakGrouping 1 0 0 1 229
multiObjBeamForming 1 0.5
clutterRemoval 0
calibDcRangeSig 0 -5 8 256
compRangeBiasAndRxChanPhase 0.0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0
measureRangeBiasAndRxChanPhase 0 1.5 0.2
CQRxSatMonitor 0 3 5 123 0
CQSigImgMonitor 0 119 4
analogMonitor 1 1

As is, I see 2D points. If I change the chirp #2 config to only be TX1 enabled, I see 3D points. My anticipation was that if I separated the two TX antennas (TX1 and TX0) by an 180 phase shift that the device would be able to determine between the two antennas and therefore give me elevation data once again. This does not seem to be the case - can anyone provide an explanation for how to get elevation data while using two TX antennas at once?

Thank you!