I am suprised some people were actually afforded the opportunity to run in a fast or slow group. When i went, our Platoon Commander was a college track-star and so, we were his training partner. He runs his 3 mile in 16min. He would always want us to catch the platoon ahead of us and so were always hauling a$$. He took turns to run the squads so i guess that was our only break.
But i would not say a 22 is bad for a female, but if there is ever any room for improvement, by all means go for it. It would only help you survive better.