Hi and thanks for your detailed answer.
I already changed to LDAC Codec, but the sound is still not as good as when I use the A2DP Driver with LDAC on windows. I even think that if I turn off “HD-Audio”" the audio is slightly better…or maybe its just more bass.
You said that I need to turn on “Bluetooth LE”. But this option is “off” and greyed out in the dev Settings. How can I turn it on?