Circulated coins such as Low Ball sets should only include coins within the PO1 to AU58 grade.
Just a personal opinion.
it is interesting that more weight seems to be given to completeness than quality in many sets
My personal opinion is:
The Everyman sets provide more points the closer to AU58 the coin is, and the LowBall set coins to receive higher evaluation the lower the grade (with PO1 being the ultimate). (PCGS agrees.)