Well I did just as Mantic predicted in one of his videos whereby I jumped from my mild Tech to my Fatboy at #3. All's well, great shave. But today I notched it up to #4. That was probably my closest shave but of course real irritation and burning has been the price. I don't know if my skin will ever handle the Fatboy #4, which I believe to be a fairly mild setting, right? But I guess I must now buy the Merkur 34C so I have "some place to go" from my Fatboy at #3.