it seems to still linger under my voice when I am actually talking.
Yes, that’s what “smoothing” does. In order to keep your voice from going all honky and bubbly from noise reduction, Smoothing makes Noise Removal stop working during your words. The idea is your voice is supposed to be loud enough and the noise quiet enough that one swamps the other. If you’re in a noisy enough room, it doesn’t work.
You have directly competing goals. Gaming computers are expected to be large, theatrically lighted, powerful… and noisy. Gaming commentators are expected to be knowledgeable, quick, accurate, entertaining… and shot in a quiet studio. Most microphones sold for this purpose are variations on a studio microphone and completely out of their league.
Ideally, you should be able to walk into the room from lunch and not be able to tell that the computer is on. If it is on, you should have it behind sound baffles in a room with sound deadening on the walls and floor. I’m sure you figured out that you can’t separate a USB microphone very far from the computer, which in a gaming computer is a very serious problem.
You can’t fix this in post production filtering as you found. You just can’t. Noise Removal is designed to remove very quiet noises like air conditioning hum or background fan whine, not throbbing gamer cabinets and white noise fans. Even if it does work, the performance never sounds quite right. Noise Removal and Vocal Removal are the two tools that look a lot better in the advertisement than they work in real life.
Run that first video.
Also, getting close to a special purpose microphone can work well. I have used an AKG C555L headset microphone. These work remarkably well retaining good vocal quality in a noisy environment.
I know it looks like a torture device, but it’s designed to fit behind your head and vanish in use, kind of like a rock-band microphone. It’s designed to be used with a radio pack, but if you don’t happen to be Nine Inch Nails, you can use it hard-wired. It’s not perfect fidelity, but it can make a noisy room vanish.
Unfortunately, it takes a mixer to run it, so it quickly runs into bux and complexity issues. That’s it sitting on the left-hand computer in this experimental podcasting setup.
Some USB Gamer headsets work pretty well. They were designed to be close-talking and to block out room and computer noises. Many of them are communications microphones and give up on the idea of good vocal fidelity, so you do have to be careful.
Recording good voice in a noisy environment has never been a walk in the park for anybody. The only real answer is to make the room as quiet as possible and/or get close to the microphone.