My end game speaks.

here is a few more between 15 and 45K https://speakerchoices.com/?pricemin=15000&pricemax=40000 

I am not sure what your current speakers are.

I wonder if you have subwoofers in your system.  If not, I added a pair of REL SHO subwoofers and it was a game changer.  Their high level connection allows them to play more like woofers to fill in the bottom end without sounding boomy.

I too feel the Focal’s sound a bit bright.  I would imagine the concrete floor could make things sound brighter.

there are so many in this group who are so knowledgeable and it will be interesting what they come up with.

The monitor audio platinum G3 and the Borresen X-Series are better than both of those speakers.

another thing that you should look at is getting the Townshend podiums that's the best upgrade you'll ever do it isolates vibrations down to three Hertz when I put it under my speakers which are the monetary platinum 200 ll it was as if I had gone to much more expensive electronics they're not cheap but they get rid of pretty well all room problems.

So as a dissenter I would buy (if you don't have a pair already) a pair of subwoofers that go deep (meaning not REL)  and pair them with the Focal's. I would not choose the Magico S7's. The sound with this pairing is immense and with your McItosh equipment it would be even more luxurious,

For me I enjoy the musical quality of the Focal's, and I find most Magico speakers somewhat harsh sounding. (exacting, grating, forced...)

Good luck with you decision though, it's a great dilemma to have.