I have another trick for getting those velocities, that I find a little more flexible and intuitive, using AD2 (I've been meaning to make a fuller post, but just saw your heading), I am also crazy about this function in AD2 (if only it had swing)
1. create straight hats

2. open AD2, select 'Beats', and press record. Press play from the transport bar in Sonar (not Step Seq, as you don't want a loop).
NOTE:pic below is before the recording of the new beat

3. Save the new beat, and set the length to one bar (or more)

4. Adjust the velocity centre, max and minimum, and the accents of 8ths and 16ths until it feels right. Then click and drag the header to the track in Sonar

5. Right click the Midi clip and select 'Convert Midi Clip to step sequencer'. Open Step Sequencer and adjust swings etc, til it feels goooooood.
"Shaft!" Only really works fully if you are using AD2's kits. but it feels a little slicker and intuitive to get the dynamics right. Shame theirs no swing in AD2 though