I used to have an Accusharp, it scrapes metal from the edge, I'm not sure that is what you want. I also have the Lansky turn box with the gray and white rods. It is good if your knife has an already established edge and you just want to touch it up. If the knife is very dull it isn't that great...
You can try different areas of the spine or try holding it at an angle. My Mora 510 wouldn't throw sparks for me unless I held the spine at a pretty steep angle. I've since flattened it on a diamond plate in one area.
When I had mine I would use 2 sided tape on wet/dry paper to polish up the edge. Worked really well.
edit: I would also use some of the 220 grit in the same way to reprofile the edge the first time, then work through the grits.