I like how I'm just ignored =P But really, high G's is that something the guard even have to face alot of? with exception to maybe the initial landing they fight on the ground. And once again, on the ground women make for worse soldiers than men.
I'd add that maybe the women are more common in PDF's because they can stay home, breed and still do their duties while the IG goes off world and is more elite (due to more strength)
If nothing else it's basic math, The average male weighs around 85kilos, the average women weighs around 60 kilos, military gear weighs around 30 kilos (probably slightly less as i'd image las cells weighs less than actual bullets) Which means that women are from the start carrying about half their body weight while the men are only carrying 1/3. Does that make a huge difference? Yes yes it does.