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Hah!
DIRAC is meant to be pretty good but you can’t beat physics with it. All that money on components, it might be worth chucking a few broadband/bass traps up if it’s a dedicated room. The curtains and rug should help with flutter but you’ll still get ringing and smearing.
I knew I needed them since moving here but I’m still shocked how much difference the panels in my studio room have made - everything sounds more expensive!
There will be some kind of big rug.
Also one wall is an opening into the rest of the house, it's quite open plan, so that will have a full blackout curtain. Also behind the sofa is a bay window which will also have a black out curtain, so effectively the rear wall and one side wall will be soft materials.
Then right opposite the speakers will be a big fat lump who can also absorb resonant frequencies.
After a month or so I will then run the DIRAC room calibration and see what difference that makes to the overall sound.