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Repeating a brushstroke lets you enhance the effect.

You can also reapply color or a paint effect along the edges of an editable area. You can apply color or a paint effect along the edges of an editable area to emphasize or blend the boundary between the editable and protected areas. For example, when you smooth the edges of an editable area, protected areas that are isolated within the editable areas are often removed. Smoothing is useful when you work with complex color masks. If the editable pixels outnumber the protected pixels, the editable area is expanded if the protected pixels outnumber the editable pixels, the protected area is expanded. For example, if you specify 10 as the radius value, 10 pixels to the left and 10 pixels to the right of the edge are checked.

Smoothing averages the grayscale values of a specified number of pixels at the edge of an editable area. You can smooth the edges of an editable area to remove sharp angles. The Trace feature is a great feature but has no way of knowing exactly what your want. For example, if you set a threshold value of 110, all pixels within the editable area that have a grayscale value of less than 110 are protected, and all pixels within the area that have a grayscale value of more than 110 are editable. Wes is correct, The only way to reduce and smooth out the jagged edges, is to use the Edit, Node mode and manuly remove, smooth and move the nodes to aquire the look and speed you want. The threshold value you specify determines where along the feathered edge you want the new, unfeathered edge to be created.

Pixels in the feathered editable area have a grayscale value ranging from 0 (black and fully protected) to 255 (white and fully editable). Compare that with the vector zoomed in to the same level. However, even with that PNG at 600dpi, if you zoom in close enough you will eventually see the pixels. Note also that I have zoomed in to 560, and still the edges of the PNG look smooth. You can remove the feathering from the edges of an editable area and create a new, sharper edge by setting a threshold value. See this example, note the PNG export settings I applied. Left to right: Before and after feathering the edges of an editable area