That is also a beautiful listening setup. And I would agree with everything you said about using the REL array.I saw Arnie's pix, the room looks amazing, would luv to hear it in action!
My experience with the array setup was buying all 6 at once and dialing them in as per REL...it takes a long time to move them around, listen, adjust etc. It sounded good (about 85% I would guess), but took having someone else to help me dial in that last bit (mostly turning them down), so now I would say they are at 95%...
My best description is that each level gives you a view of another level of the bass, with it divided into low, mid and upper. As you dial these in you are just so much more aware of additional information that was just muddier before or unheard.
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Arnie