Alright, well thanks for responding Betula.
I'm sure if I were to spring for a 465 or whatever my eyes would light up and I'd go ''oohhhh!!! now I get it'' - but un/fortunately I'm running a business and investments need to either bring clear returns, or meaningful improvements to performance which don't hamper margins too much in the short term.
The combo of 4Z with 2/4 Pro is already leagues ahead of what I was using before, specs are uncommonly good for the price,
both of them sit on this year's balance sheet.
I'd spoken with others in my area before making investments, and the general consensus was that the 2/4 pro is a very capable choice as an all-in-one reference unit which punches well above its weight, and even offers improvements over the other ADI models. Only one peer suggested pairing it with a separate, dedicated amp.
I don't doubt that there's more juice in the berry, but currently my glass is full.