Just had my first shave with my new sensor which I need to use offshore. Normal pre-post routine, MWF, alum, Nivea balm. My skin feels really itchy; could this be something on the lube strip or is it a reaction to the pulling and cutting action of the twin blade? I don't remember having a problem when I used M3; is it possible DE and straights have softened my skin and it needs to toughen up again to get used to the cart?