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Another thing to avoid pulling is adequate skin stretching. You don't have to pull it drum tight but if you don't pull the skin taut enough the razor will tend to pull regardless of how sharp it is....

It could be a combination of technique, or the lack of it or..... stropping. An inexperienced hand can dull a shave ready edge PDQ if the spine is lifted while stropping 'rolling' the edge. I am sure...