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You need suspecting Bluetooth devices fault too.
Please test Bluetooth device. Yes you are right that you can adjust volume level in engineering mode.
Go to call dialer and type in ( *#*#3646633#*#* ) then hardware testing - audio - choose option of handsfree and change value to 252 on NB and WB.
If doesn't working please increase other value too. You no need change DL Gain.
I don't have same issues on my device.
Also please update phone too latest available firmware and perform factory reset. But after factory reset you need again adjust values in engineering mode.
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