The individual risk for each female participant do go down if the number of female participants goes up. I would not categorize it as either bad or good, just an aspect of the nature of risk.

In the end through, I only trust my own numbers as a vague hint about what could be. There is just too many assumptions I make and factors to consider (such as group behavior, predator behavior, and so on). I hope a researcher, research student, or foundation will get interested in this topic so the answer to the question can be made once and for all.