You may be trying too hard. All I do is run the edge over a clamped file a couple of times freehand and then roll a little bur on the edges by clamping the scraper and running two or three times over each edge at a slight angle. I get lots of fine shavings. The more pressure you use with the burnisher, the more aggressive the burr.

The early bird gets the worm but its the second mouse that gets the cheese.