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Since you have a 12k stone, I assume it is a naniwa superstone , give it a try. If you're getting a DFS off the 8k norton, through your own honing, you have the skills to take advantage of the 12k.

Which finishing stone did you buy ? A higher grit finisher can give a smoother and maybe sharper edge and feel to the shave. Shave technique plays a large part in the results of the shave in addition...