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While doing the light reflecting test that BobH is recommending, try other bevel set tests at the same time. If you see a shinny spot, see if you can get correlation with other tests TNT TPT etc....

Early in my straight razor experience, I had a razor acting the way you are describing. I could touch up the edge with 8k and 12k hones and get a few good shaves but the edge would not last. I...