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OK - it's bumping over parts of your beard? It could be stropping as knochrph suggests - perhaps you are dulling the edge when you strop. Have you tried a sharpness test on the blade after you strop?...

I've never used a singing razor, but from what I've read here I am under the impression that they are thin and flex a bit. I've personally never had a lot of luck with the thinner blades on my beard...