Hey Troy. Hows the work with the subs going?
I somehow missed this thread the first time around.
I will add my two cents worth (I still have a stash) to say that in my case, bass trapping did pretty much nothing for me, but EQ using REW made a huge difference.
You need to do a bunch of sweeps to see what is causing your boom.
In my case, I had a 15 dB peak at around 56 Hz that no amount of treatments would take care of. I added three EQ cuts that really cleaned up my bass.
I was left with some narrow holes in the spectrum, one around 70 Hz that neither trapping nor additional EQ would help (square room).