@audiodidact perhaps you might consider sending these photos to GIK and get their opinion. Everything we post is pure guesswork and most likely a shot in the dark, which regrettably would be a continuation of your current strategy.
From the photos, it seems as if you have alot of reflective surfaces with alot of irregular angles. I’m not sure, even if treated, whether Maggies would ever perform at their best. Repeat: buy Jim Smith’s book, get some visual advice from GIK but from the photos, youve got a number of challenges ahead. You have a great deal of gear and TV between the speakers, which are inset within an alcove, a fireplace to the left, some funky drywall angles, no symmetry, etc.
You’ve committed the same sins we all have at one time or another. Early on, I had stacks of gear purchased without a strategy, with no idea whether there is system synergy but hey, an anonymous reviwer gave it high marks in his/her room with his/her gear. Have you made a list of your audio priorities? Calculate your budget (including the resale value of everything you’ve got) and start from there. In order of importance, treat the space acoustically, then choose speakers to work with the room, then the proper gear to drive them.
Today, rather than the stacks of gear and a mosh pit of cables everywhere, mismatched due to a lack of a proper plan, I now have a pair of speakers, an integrated amp and a dac and I’ve never enjoyed better sound in my home. I decided I would rather own one exceptional item than three or more average items. If you have a plan and a strategy to reach the goal, you will likely find that you will increase performance by subtracting variables and from the photos, you have an opportunity to achieve addition by subtraction.