Yep that's an old trick, the cops delay the blood test so it's as high as possible. Your BAL was probably a lot lower while you were actually driving. (not that it matters with a DUI)
I don't think you'll have much luck with the specialty ins. companies.
The DUI and DWI are intended to be different things, but they f**k you the same for either. By default they charge you with DUI so they don't have to prove your drunk or not.