I think the core issue is that you are trying to reconcile full of doubt about having the truth…
Way back, like on page 2 of this thread, I shared the following:
Be very clear on one thing, both to her but especially yourself:
The poly has a purpose. It’s the watershed moment where she passes, and therefore YOU need to acknowledge that you have a base of truth to work from, or she fails where you have to acknowledge that she isn’t a candidate for reconciliation. If you aren’t going to acknowledge either, don’t bother with the poly.
And now, despite her having cleared the poly, as you said yourself:
The operator, who has some 25 years in the business, told us at the end of the session that my wife had passed the questions with no deception indicated.
You have doubts…
Doubts based on the operator not providing written notes several days/weeks after he did the test. A walk-in test, with no legal implication and therefore no real need for notes…
OK – I guess we will have those that insist reliability is often stated at 60% (most validated and reliable surveys give it +80%), that it’s easy to fake a poly (yes – if the questions don’t have serious consequences for you and you can do several test-runs), or maybe you think the operator (selected by you) is incompetent or even worse – in cahoots with the wife. Well… those doubts should have been dealt with BEFORE deciding on a poly. Like a wise man once said: If you aren’t going to acknowledge either, don’t bother with the poly…
I think this requires you go back to basics:
What is required so that YOU believe you have a good-enough truth to work from?
Another poly? Hypnosis? A forensic dive into her phone data, social media?
Without having a sense that you know what you are dealing with there is IMHO no real hope for any form of real reconciliation. Even if you two manage to create some form of acceptable marriage, 20 years from now you will still be wondering what really happened. A key to recovery and reconciliation is a belief you have the truth.
My suggestion:
As always: Open conversation. Tell her you have reason to doubt the poly. Give her the option to SAFELY tell you more or the truth. If she persists it’s already out… ask how you two can confirm that. If that’s another poly… well… remember:
Be very clear on one thing, both to her but especially yourself:
The poly has a purpose. It’s the watershed moment where she passes, and therefore YOU need to acknowledge that you have a base of truth to work from, or she fails where you have to acknowledge that she isn’t a candidate for reconciliation. If you aren’t going to acknowledge either, don’t bother with the poly
Finally: The bandleader analogy and the sheet music: If the drummer is competent and is the only one you have available to play the off-beat, irregular rhythm fusion jazz you have planned, then firing him for not getting the sheet music isn’t the solution. It’s rather understanding the limitations and working around them. 
