Sony Gold Bluetooth headset works on Windows but i can't use volume slider to control it

I have a Sony Gold Wireless headset and it works perfectly fine, the only issue is that the windows volume Control (the slide in the task bark) doesn't affect it at all. So in order to change the volume i have to either use the built-in buttons of the headset, or whatever software am currently using, this is not a critical issue but am very used to the volume buttons i have in the keyboard (specially the "Mute" button).

What i tried so far :

• Making it the default playback device :

• Enabling bluetooth services :

I also tried using the "troubleshoot tool" and updating the driver, nothing solved this issue, because like i said, the headset is playing Sound correctly, its just that somehow it overwrite windows sound control or something.

Also did some comparison with my Razer headset and i noticed something a bit weird,

In my other Windows-10 pc, when playing AC/DC - Highway to hell solo on full volume, the playback device volume bars looks like this :

Playing the exact same song from the exact same source (Spotify) with full volume and also with the Razer headset, the volume bars don't get passed "4-5 bars" even thought that in my ears it's as loud as the other computer :

And for the sony Headset, it shows the same result in the "bad" and "good" PC (can't pass 4-5 bars) :

I have no idea if this can help or even if it has any meaning but I just noticed that its kinda weird, even when i use the speakers the volume bars are always limited to "4-5 bars".

But again, my main issue is that i want this slider

to work, Cause even that its set to Mute, Windows is still doing a tons of Sound.

Thank you

Edit

Totally forgot to say that am running :

Windows 10 - Pro; Version 1607

Edit 2

Another thing that i forgot, using the volume mixer has some strange results too, changing the volume of an individual software works perfectly :

in this screenshot

I was able to reduce Spotify volume to ~30%.

Then i took it back to match main system volume (100%) and then reduced the whole System volume

,and as always, absolutely no effect, even when its muted.

Got the same problem, but I managed with a workarround to make the media keys to affect the sound.

I installed the NirCmd, a nice utillity for windows where you can run a specific command as change the volume for a specific application (or the current one). What I did:

• Installed NirCmd and added to the Windows Directory (to run from anywhere)
• Created two scripts: "Volume+.bat" and "Volume-.bat" with the following contents:

Volume+

nircmd changeappvolume Spotify.exe +0.1
nircmd changeappvolume focused +0.1

Volume-

nircmd changeappvolume Spotify.exe -0.1
nircmd changeappvolume focused -0.1

Then, using the AutoHotKey app, I created this config:

Volume_Up:: Run, pathtobat\volume+.bat, , Hide
Volume_Down:: Run, pathtobat\volume-.bat, ,Hide
RETURN

Now, using the media keys feels very natural, affecting the backgroud music and the active window.