I am getting popping and crackling with bluetooth headphones whenever the audio starts or stops but not through the speakers. Forwarding through a youtube video sounds like shit.
Have you been able to find a solution yourself? I might try another bluetooth adapter before I contact support, I havent had an audio issue like since since the AMD Duron days.
With Pulseaudio Volume Control, Double check the headset playpack type - HSP vs A2DP? If it sounds like a phone in a tunnel it’s set to HSP which is wrong.
Can you install pavucontrol and take a screenshot of the Configuration tab with the headset paired and connected?