Just FYI Paul...
The reason your focus is all over the place, and many images the focus is just not where you want it to be:
It's because you are letting the CAMERA choose the focusing point. When shooting upskirts, you NEVER want the camera to choose the focus point, because the camera has no idea where the good bits are.
When shooting ups, you definitely want to choose the center focus point, & force the camera to only use this point (check the manual). Most cameras, especially Nikon & Canon DSLRs (like your Kiss X4) have a much higher sensitivity / accuracy on the center focus point, as well as being able to find contrast lines in both vertical & horizontal directions. This one simple change in the settings will save you a lot of heartache when you go out next summer. Nothing worse than getting home & realizing a ton of your hard fought pics have come out bad.
You might also consider bumping the shutter speed up a notch or two... 1/320th of a second is just barely enough when you have the lens racked all the way to 300mm, 1/500th would be safer if the light is good. Personally, I'd bump the ISO higher so I could keep the shutter speed higher. Anything up to ISO 1600 can be cleaned up pretty good in modern software noise reduction, maybe even 3200 on a cloudy day.
Freeware like PhotoME lets you check all your shooting data, including focus points, after the fact, if your editing software does not show this data.
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