Practice playing at three different stick heights.
1) Stick 90* to snare head or pointing at 12:00.
2) Stick 45* to snare head or pointing at 1:30.
3) Stick 3-4" off of snare head, probably about 2:30.
That will give you the control to switch from an accented note to an unaccented note. (That's paraphrased from Brain's Lessons.)
Watch the 4th video from the top "Heights of the Free Stroke" and the three Moeller videos at the bottom: http://www.vicfirth.com/education/drums ... ularo.html