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The Merkur 39C is the long handled Slant, is it not? It's considered an overly agressive razor, so if you overdo it you'll definitely be courting irritation, especially with a Feather...

I agree with coach, only if your face can handle it. But as for your question, "should we be doing four pass shaves for the ultimate in smoothness" - in all likeliness, no. I say that for two...