PacePro strategies not suitable for slower runners

I have just tried to set up a PacePro strategy for the recent CCC 2019 course(just a hypothetical). I have noticed that compared to the official cutoff time it only allows "crazy fast" paces to be inserted. The official cut off for CCC is >26 hours, and puting this course into PacePro it alows only like 15h with an avarege pace of 8,12 min/km. Now< i have no doubt that there are those who can manage this tempo up and down for 100 K, however I think it should be more flexible. Also I am not sure if it realy takes into consideration the differences of up and down- it seems pretty even for the whole 100 K? Any thoughts as to what am I doing wrong? Apart for being to slow....