I commend you for all your additional work, esp in post 13! Wrt the above-
In my opinion, comparing the OV to a prior sale price and the predominant neighborhood value just opens the door to problems. A benchmark comparison is an appraisal ( USPAP). Meaning,you have done two additional appraisals by comparing your OV to a prior price and a neighborhood value. That means, per USPAP you need a workfile for each appraisal. I am not trying to be a nag, just stating the reality of it.
In addition, you now provided more fodder for someone to challenge you, wrt a prior price or predomiante value. Why go there? It is not required, it can confuse people, and possibly cause problems at some point for an appraiser.