Photoshop :: CS6 Erodible Dry Media Brushes Out Of Alignment?

The problem is that the boundaries of an image re-created with the Pattern Stamp Tool and a new dry media brush, say the Square Charcoal brush, are just off alignment with  the edges in an outline drawing of the same image made on a layer above using the Glowing Edges filter.

  This means that as you paint back with the Square Charcoal brush the image is just shifted a bit to the right when look at through the Glowing Edges (in Multiply blend mode) outline drawing (you need to invert and desaturate the Glowing edges drawing to see a black on white drawing).
 
This problem gets less noticeable as the size of the erodible dry media brush is decreased and does not seem to happen at all with other Photoshop brushes like a standard Hard Round or Chalk brush.  This problem occurs when the "Aligned" box is selected in the Tool Options bar so a failure to select that option is not the issue.
 
Are others seeing this and is there a way round it (other than not using the erodible brushes)?  It doesn't seem to matter at what tilt the brushes are held.