wider soundstage maybe more lifelike energy, little more low end kick
If you can accommodate them, adding a couple subs may be the most cost effective and effective way to achieve what you’re looking for. A pair of SVS SB1000 Pro subs only cost about $1100, and they offer a generous 45-day risk free trial including shipping both ways so why not?
But if that’s not feasible I’d look at this Pass Labs XA25 that should give you a lot of what you’re looking for…
Just a couple ideas, and best of luck.