I REALLy love what youre doing, but for permanence sake and safety of your voice, can you send me a DM on discord @aeroarrow_ of another take, this time with using your diaphragm, it'll open up that growly sound and instead of an act of pure aggression, it'll add strength and volume to the character, then you can implement a bit of growl. TLDR: take another take with your diaphragm as your main support to sound bigger and more intimidating.