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Pick up an eye loupe at a Jewelry supply like Widget Supply. I use a 30x, the one they are selling for $17.00. It will come in very handy. There is no set number for strokes. It is whatever it takes....

I would suggest you go back to the norton and get the razor back to the level of sharpness you attained in the first place. Then strop and shave. If it is shaving well off of the 8k it is ready to go...