Hang in there! You are not alone.
With that being said it is still utterly possible they are snowing us badly but if she is truly remorseful and a good portion of you believes you have the major details (whether via polygraph, irrefutable evidence, blind faith, or otherwise) what has helped me from this point is realizing the rest of the little details do not matter anymore, what matters is she had an A.
I had 2 stories in my head, they both had the same events and timings but the thoughts and motivations were different. I outlined both the WBF and he said neither were true - I wasn't there. As time passes he feels differently about events, so to get back to how they were feeling at the time I have to re-read the emails. I don't do that so much anymore and if anything it shows me how far we've come.
Personally it took me a long time to buy that there was truly NC, and was being followed. because in the early R it was broken repeatedly. But that was different than my gut screaming that his snippy attitude, his quick closing of the computer when I approached, the lock on his phone changing.....
What I did when I had these moments, was to focus on who he was being now. Did he really get it. Did he own his decision, was he doing the work to heal himself, us? That was what mattered. Often that unease is our brains way of giving us a check to be sure we are still safe.
Hang in there look at current behaviors and actions, if they are met with anger, upset, rudness, mean comments, then be alert. If she is kind, understanding, and doing the work, then remind yourself this isn't the person that she was when she committed infidelity. It takes a good while before you start to feel safe.