If the core of the group is younger, they may have had a lot more exposure to pistols as fighting tools, and very little to revolvers. I have seen women who can't really shoot a K frame well due to trigger reach, and J frames bring plenty of their own handicaps.
Well over 30 years ago, Professor Bowman of the University of Illinois Police Training Institute (one of the few academies in the State and by far the best firearms program at the time) wrote an article about how much better female recruits did with 1911s vs. K frames due to the ergonomics. The difference in performance was staggering and almost entirely a difference in fit for the smaller hands. I probably still have a copy of the article somewhere. John and the majority of the firearms instructors were Gunsite alumni and instructors there.