Faerychic, we are so similar! My bodyfat at the center was 36% last time. At the college's fitness lab, they did it 3 ways: impedance, which was 37, calipers, which was 32, and this new thing called a BodPod, which is supposed to be the most accurate of all, right up there with underwater tests. You get in this chambers that measures the volume of space you take up (I honestly don't know what it was doing- it was freaky) The guy said those variations were exactly what he expected to see, with calipers being the lowest since those can't measure what's in and around your organs.
Definitely 30% is the highest that is within "normal" range. But you can get there with strength training and a maintenance plan. You might google Tom Venuto The Body Fat Solution - he explains all this well.
The guy at the lab had never met me before and doesnt know all I have been doing so I felt he gave me a bit of a lecture about stuff I motly already know. Not his fault, but i felt like I got bad news, when In fact- I'm doing great!
I'm in a10/12 also. No more 16s EVER AGAIN!