I have noticed that razors with more exposure often cause my blades to dull faster. For example, I normally get 6 shaves out of an Astra SP using my Rex Ambassador or any of my vintage Gillettes. If I use the same blade in an R41 or iKon Standard, the blade will start tugging after only 3 or 4 shaves. Anyone else experience this or is this just some flaw in my technique or prep? My typical soaps are ARKO, Williams Mug Soap, B&M, Chiseled Face and Shannon's Soaps. My typical blades are Astra SP, Personna Reds, Nacet, King CG, 7 O'Clock Yellows. I have been wet shaving for more than 10 years but never really noticed this problem until recently. Razors with bigger gaps don't seem to cause extra wear, only razors with greater exposure. For the record, I don't do well with larger gaps and gravitate toward more exposure when I want a closer shave.