Nicely curated system Evan!
I had the same problem in a large room such as you have. I also like to listen to full range music quietly in the late evening.
I upgraded my REL T7/x to REL Serie S which added more presence. I also added a Manley Massive Passive EQ. While I like tweaking on the EQ the most substantive and satisfying upgrade was the subs with the correct crossover settings.
I found this valuable https://www.youtube.com/watch?v=Rdo4yWobFwc

