Disregard, the crossover switch on the back of my subwoofer somehow was flipped to in instead of out. That coupled with a 40 hz crossover setting on the sub vs 80 hz on my receiver was wrecking havoc on my frequency response.
I plan to stick with the one sub given I am now getting good enough...
If there is another thread discussing the successful use of mixing a ported sub (for low extension) and using a second sealed sub for mitigating a mid-bass null at the listening position with extreme room acoustics and placement issues, please direct me.
In short, I have a primary mid-bass...