As a youngster I became very familiar with a razor strop. Our principal in grade school sharpened my senses with a strop to my hind end a few times.Similar here as I have a Gillette Sensor two blade razor. I can get about two months worth of shaves out of each "cartridge." My youngest son also went out online and found a razor strop that is maybe 18 inches long and strops daily. He gets even more usage from each cartridge for his razor (not sure which one) than I get with mine.
Maybe I need to find a strop myself?