That is good advice. This is one of the reasons I've put off adding the treatments. Been focused on just getting what I have calibrated. Thanks for the link to Pogre subs. One thing I'm kicking myself on is not running a long enough cable for the right sub. My original position for the sub wasn't under the screen but I've found it better than the corner where I had it before. Now my cord is a bit short. and need some more discrete cord management overall.
BTW, the other thing I would do over is put more accent lighting in the platform (especially the front). I ran power to it so I could plug in the cables but when all the lights are off it is still a bit too dark to navigate around.