I have eliminated my sound variances with the AT2020usb. I am working on my mic technique and consistently addressing the mic directly. In the old position I was reading in, I had a tendency to angle my head slightly to read and that subtle rotation was part of the problem. The second change I made was to turn down the recording volume. This alone has improved my overall sound quality and reduced my treatments to just LF Rolloff, default declicker, set RMS to -22 to pass the wonderful acx check plug-in. I don't need it to pass but I also run the 6,6,6 noise reduction as I like a little more silence. It does not change the "me sounding like me" to amplify a bit. My recording quality and voice really changed when going the other way and trying to get the hum and background noise quieted. I was focused for awhile on trying to hit all of the requirements with no processing but I am not one of the lucky ones who can pull that off. Now, with my level at 70, I can comfortably speak naturally and the mic is way less sensitive to all noises and I have a better product overall. I was so close to getting a new mic and interface but am sticking with this mic for now. If I ever decide to break out of romance books in MP3, I may have to change my equipment but for now I am in my groove.
Thanks for reading, I just wanted to post a follow-up.