What is your method for testing blades?
Seriously. Do you use a spreadsheet? I can remember what blade(s) are currently in whatever razor I'm using and the blade that was in last week, assuming it's the same razor, but that's about it. Multiple razors over weeks with different blades? Sheesh, my skin changes month to month, I can't even say the results I record in July would be informative in December. Does anyone have a system that they're really satisfied with?