I just had a strange experience with a new Persona Red. I put a new blade in my Merkur 34C, my regular razor, and started my shave. I noticed after my first pass that my beard was hardly reduced, and even after the against the grain pass there was still more stubble than usual. I eventually got an acceptable shave, but it seemed to take more effort than usual, especially with a new blade. Can one just come across a dud now and then?