Room acoustics

It is 100% germane to the scenario in your room. It has to be mentioned, noted/corrected and then--deal with the entire package. which has now been done.

Good luck fixing it. (bass-midbass)

Your big problem will be that the measurements will be way off in the bass, and considered by the measurement formulas/methods to be impossible to navigate and thus.... not relevant. Even your measurement systems, a weighting, c weighting, ...they all ignore the bass. Bass is not looked at in professional environments and professional scenarios.

"Since the ear is insensitive to 500hz on down, we’re not going to measure it!"
http://www.noisemeters.ca/help/faq/frequency-weighting.asp
Seriously.

Yet your bass to midbass will be the the source of the vast majority of your room issues. As in: the heart of the matter.

the mid-high parts they talk about dealing with, anyone can fix those with a small bit of internet research. the odd throw rug, some simple diffusion, common knowledge stuff.

Bass traps, the vast majority of them, barely do much of anything at all. We hear the small bits they do and we take what we can get from them, happy for any minor improvement.

Going into a commercial box or Imax theater and listening to the surround systems in them is a horror show. Awful sound and awful acoustics. These are supposedly professionally done systems. It illustrates how little even the pros know about bass and midbass and how to tame it. Ultimately, billions of dollars involved in getting it right, and they can’t get it done.

now you know why some guys bring big leafy plants to shows...and put them in the corners and the hotspots of their room...