I agree with my esteemed friend, @Marco.I believe that any blade must always be super sharp regardless of the agressiveness of the razor. That said, what only works for me are very mild DEs, again coupled with an extremely sharp blade.
My blade protocols (approximate):
- Feather DE blades: 3 shaves.
- Other DE blades: 5 - 6 shaves.
- AC blades: 9 - 11 shaves.
- GEM blades: 10 - 12 shaves.