Thinking of adding a subwoofer for more bass.

Martykl
my objection to bass room eq is that once you eq out the 100-130hz rise and the nulls at 50 + 80, what do you have?
my guess would be that you end up with other problems or a fairly small sweet spot....the 2nd would work for an individual up to 4 person space, but for a HT where you'd want more persons to share good sound, you may be in for trouble.

If you are happy with current rig, than by all means LISTEN.
For a single sweet spot room, you got it licked. How big will those 'resonators be? I think my den acts like one at pretty low freqs.
My problem is a little different, my system being used by groups sometimes, like when the relatives drop in. Optimization over a larger space is an issue. I think I may have caught a break in this room, at least in the bass, it being 8 sided, and a few 45 degree walls.