Mea culpa, mea culpa, mea culpa!
It turns out that it was user error (as we like to say, an ID:10T error) combined perhaps with wonky UI design on the UpMap side
When selecting a map (I went with the "Zard FD" for headers, de-cat and dB-killer) I _thought_ was looking at a list of US maps, but they jumble together US and EU maps with no apparent rhyme or reason to the sort order, and of course... I inadvertently grabbed the EU version of the map. Realized my problem, got the correct map ($$$ LOL @ expensive mistake) and that one flashed up A-OK.
Hoping this map works well enough for the exhaust setup I have now. It certainly can't be worse than the OEM map, I'm thinking. Now... to go see how it goes...
Hopefully others can learn from my silly mistake.
__Jason