Like I said - try a flat brush (rather than a round bristle brush) and make sure there is hardly any paint coming off the brush. What you can do is dab it in the paint and drag it across a paper towel until it leaves only a faint trail of paint.
Light brush strokes are very important as well. It is much better to have to go over an area several times than press too hard and get too much paint over a single pass.
I still think you will get a better overall look by washes, highlights, and general layering than you will get with drybrushing. Drybrushing in general tends to be uneven and will usually leave a chalky appearance. Usually the effort of getting a smooth transition of drybrushing (which is possible) is greater than simply highlighting and blending the layers.
Hope this helps.
Cheers,
-Mike
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