Ian, what are you spotting it against? The scraper you made sounds fine, but if you're pinspotting (trying to get 20 spots per inch or better), you need a honed blade with a decent radius.
You can do a good job honing the blade with one of those cheap dipstick diamond hones from Lowes. That's what I used when I scraped the reference surface on my Millrite:
Hopefully Forrest will jump in...
"The problem with the world is that the intelligent people are full of doubts, while the stupid ones are full of confidence."