Have you tried adding a UseJointStereo setting in the registry?
HKLM>Software>Microsoft>Bluetooth>A2DP>Settings
UseJointStereo DWORD Value=2
You could also try setting the DWORD Value to 0 or 1. I think the recommended setting is 1, but on my Plantronics 855, I get better quality stereo sound if I set it to 2.
I'd recommend turning off the headset, deleting it in the Bluetooth connections, turning off BT, making the registry change, turning BT back on, waiting a few seconds, then turning the headset back on to re-pair it. At that point it should offer you options for setting it as "Wireless Stereo" and "Hands-free."
kal
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