Your TV does not seem to support deep colour (10-bit video) which is surprising for a 2016 model. Do you see the same issue if you plug Vero into the TV direct?
It is also surprising that 422 shows banding while 444 (8-bit) does not. You can force Vero to output 8 bits using the commandline via ssh and typing:
echo 4448bitnow | sudo tee /sys/class/amhdmitx/amhdmitx0/attr
If that works, we can tell you how to make that setting permanent (ie survive a re-boot).