Add to /etc/pulse/default.pa to automatically switch pulseaudio sink to Bluez:
.ifexists module-bluetooth-discover.so load-module module-bluetooth-discover load-module module-switch-on-connect # Add this .endif
Modify /etc/bluetooth/audio.conf to auto select A2DP profile (instead of HSP/HFP):
[General] Disable=Headset # Add this
Apply changes:
sudo pulseaudio -k # Restarts pulseaudio sudo restart --system bluetooth # Restarts BT