Different mice react differently to different DPI settings. Very few mice actually perform better at higher DPI, that's usually where you start to see weird positive or negative accel issues. Also, monitor refresh rate and resolution have absolutely nothing to do with your mouse's imperfections, that's all determined by the sensor in the mouse.
That said, the DA still has one of the best sensors on the market and the weirdness you feel when turning on or off raw input is probably the built in accel in Windows kicking in. If you're on Windows 7 turning off "enhance pointer precision" doesn't fully disable accel and, as tranche said, if you haven't used a registry fix that's probably the difference you feel when you toggle raw input.
Also to answer the original question in short: For sensitivity calculators raw input enabled is equivalent to a Windows sensitivity of 6/11 with the MarkC mouse fix(or some other registry fix) applied to disable Windows built in mouse acceleration.