I do it the same way, bring a burr up on the non beveled side then hold broadhead flat with non beveled side on file or stone and a few light strokes to remove the burr. By doing it this way I actually found the grizzly's easier to sharpen than the SB no mercy. I seem to struggle more with the triple layer tip single bevels, but thats just me. That being said it does take me a while (about 30-45 min per head) to get them razor sharp out of the package, but find them very easy to touch up after that. Some say thats too long or too much work, but I'm not in it looking for shortcuts. For me thats where the enjoyment and satisfaction comes from, putting in the time and effort, doing things myself, and making sure they're done right. Just my two cents
Travis