Well, at least you made said salesman's day with the Naim stack purchase. 👍🤷♂️
The only 'stack' I've ever owned was the Kenwood 'L-07' series with the mono amps; since it's been a 'this or that with what' episode that I finally fought into submission. More or less, anyway...;)
What 'tweaked you off' about the old setup? Resolution, voice clarities, instruments 'off' a tad, and all the other terminology your read here?
"Hard to Rx a patient when asked about the pain, it's described as ''...everything...kinda...' "