Deep tight bass requires proper room treatment. Broadband bass control in the cutouts everywhere that isn't physically taken up by the speakers is fair game and should be done. I'd also do something reasonably thick on the rear wall do deal with nulls off the back and slap opposite the screen.
I can't see from the pics how solid the inner portions of your 'cutouts' are nor what the front is actually like (assume it's just cloth over framing).
Also, the screen is VERY large for a room that size forcing the speakers to the side walls which also causes boundary related bass issues. You'll need to treat right next to them no matter where you leave them.
Once you get those things done, you might still have better luck doing a manual measurement and EQ adjustment. Audessey makes averaged adjustments to get the best for multiple locations. That's not always the best thing for the 1 or 2 seats you use 99% of the time.
Bryan