No, I'm thinking - as many scientists do - that the efficiency of a filter will increase in accordance with a power law model. As the pores are plugged, there are less pores for trash to pass through, as bigger pores are partially clogged, littler pores are created. If the pores are smaller on the M1, which as I believe the data indicate they are, then the efficiency of that filter starts off higher and will only improve as it's pores are plugged. If the EaO has greater surface area, then it stands to reason that there are more total pores. With more pores to start with, it's efficiency would improve more slowly.
I really enjoy these discussions, Gary. You're a very knowledgeable guy and I always have fun. Hopefully these feelings are reciprocated.