Razer blackshark v2 audio card

Hello! I have just bought this amazing headset. However, my microphone makes really nasal sound, like I had a flu and holding my nose at the same time. I tried to make it in Razer app - there´s only small decibel change limit available, so I tried EQ APO, but its still incredibly nasal. I would love to turn off the built in audio card, maybe that would help, because other headsets without built in audio card dont sound so nasal. However, I have no idea if it is even possible to do so. Or maybe theres another solution available? Friends are laughing at me that i sound like clown, so yeah, this situation is "solve or buy different headset" one. Everything else about this headset is excellent. Thank you for help! <3