As you said, not knowing the configuration at the time makes a difference. Especially on a course like WyCo. But, that said, I know that Otto Spiers shot a 50 at WyCo League last year with the course set mostly short. This tied the 50 that LaRon Harris shot before the course became permanent. Also, if memory serves, Pete Cashen shot a 53 with the course set mostly long at league in 03.
I have league records for WyCo so those are official scores except for the length of the course at the time of the event. I will make more of an effort to monitor that now that I have the majority of the distances out there now.