Pumice stone has been used in starting fires for years by soaking it in whatever flammable liquid is available. It's as close as your local store that sells healthcare products and inexpensive.
Your problem i believe is that you have to much metal behind the edge. Take your 320 grit paper and put it on a hard surface. Hold the blade at a 20 degree angle and alternate strokes on each side of the blade until you feel a burr.Move on to your finishing grit paper on a soft surface and again...
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