Try this on for size...

Day One:
Genco Seneca Chief Razor (honed by Glen, so I know it's scary sharp)
SRP 3" Black Latigo Strop
Proraso/C.O. Bigelow shave cream
Van der Hagen Boar Brush
Alum Block
Master's Bay Rum
Results are BBS!

Day Two:
Genco Seneca Chief Razor
SRP 3" Black Latigo Strop
Proraso/C.O. Bigelow shave cream
Van der Hagen Boar Brush
Alum Block
Master's Bay Rum
Results are only DFS

Day Three:
Genco Seneca Chief Razor
SRP 3" Black Latigo Strop
Proraso/C.O. Bigelow shave cream
Van der Hagen Boar Brush
Alum Block
Master's Bay Rum
Results are BBS again!

Now, class, can you tell me what two variables could have caused this?

Hint: one has to do with the number 30