1) are you working at a table, and do you recommend that?
2) I like the tool you were using and actually brings up a point. I always wondered what was the reason that copper is suggested? For my part, I notice that it stains the flint whereas steel doesn't. I've got a 3/16 brass rod, would that work? Right now, I'm mostly using sharpened antler tips.
3) The way I'm seeing it, you use the heavy steel tip for course flaking, then the finer copper to 'sharpen' the point. Is that right?
4) I find that I use the billet 90% of the time, and only really finish up with the flaking tools by burroughing channels for hafting. I think I need to put more emphasis on flaking.