I don't think that's a road worth going down. Maybe I was thin-skinned, maybe some of the comments came across more pointed than intended. No hard feelings either way.
Tenor aside, there wasn't a lot I felt I could add to my original post, and you guys did basically answer my question by making it clear that room treatment was more complicated than I expected, even on the small scale I was attempting.
While aesthetic concerns are not foremost with my room, it is not a 100% dedicated space and 4" thick panels are not something I'm interested in looking at. Plus, between windows and other obstructions, I don't have a lot of bare wall to work with. I had tried treating the few surfaces that could even realistically be treated (lower towards the floor), it didn't make any measurable difference, and so I'm chalking it up to a lesson learned.
In any event I think I'm close to the point where I'm chasing measurements more than enjoying the setup. I watched Ready Player One yesterday with some friends who were blown away. Nobody other than me was even thinking about a slight peak here or there. Perhaps that's the real lesson.
Thanks for an interesting thread.
Endaar