I'm glad to hear after sticking with it that you're skin is responding better shaving with a straight razor than previously with other methods. I'm not surprised. I also have sensitive skin. You've mentioned something that interests me; My skin has always exhibited the redness response, almost instantly to even mild abrasion. In my lifetime, I've lost count of the number of times someone will inadvertently say "What did you do to your neck, face, etc?!" I'll then realize that I simply gently scratched my neck or face.

What's that called, then?

Chris L