How good can it get, really? - my stereo sounds amazing!

@davegardner OP
I feel the same.
In all, I am very pleased with my system, in my space.
My little pair of Maggies, very well integrated with a ADS sub and driven by a Cronus Mag II and meticulously set up, in a well treated room, sounds incredible. Whether standing, sitting or laying down, when listening late evenings, at moderate levels - the timber, placement and air seems just right and stays focused where it belongs - on a large stage behind and beyond the plain of the speakers 
Even though there are one or two things I would like to upgrade, I’m not sure that the upgrades would be worth the cost, or if it would even make an improvement ....Jim
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I have found my stereo sounds especially great after a bit of cannabis and a glass or two of wine. Even a modest system benefits from this tweak.

@hdbc3036  :-)

Have to admit - a cold brew or a couple of wines may have something to do with the enjoyment of my late evening audio sessions....Jim

I agree that you should just enjoy what you have. Having said that one thing that improved my enjoyment of my 805D3 speakers is one of the B&W subs. Namely the Db2Dwhich is stereo in one box. It includes built in frequency settings for their speakers.  The integration seems just about spot to me and no need for floor standing speakers. 
 
Cheers!

Do the experiment, take them all out of the room. Report your findings

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Did that experiment decades ago....and frankly can’t be bothered to haul stuff into my listening room at your command. Was actually curious what exactly your experience was....were veils removed ?....did the sound-stage extend beyond the room?....was there a frequency specific suck-out?....was there a frequency specific glare or overhang ?....will you actually answer the question originally asked ?