I no longer have a mach 3, just the pro glide. From my memory the Mach 3 was my best shave with a cartridge but I had never shaved using the new Pro glide blades and I can see they seem to be beating the Mach 3. They are indeed thinner and coated with something as the ads say. They seem to last forever with the right prep.

I think the couple marginal shaves early on were due to allergic reaction with MWF and Trumpers Sandalwood Skin Food which I have had irritation with before but never gave it so much thought until now. I am allergic to animal fibers like wool and most traditional tallow based shower soaps like ivory and it's thousand variations also cause me to itch and irritate especially in the dry winter.

I have one Fusion 5 blade the model before the Pro Glide which I could also try this using but the Pro Glide does seem better then my previous Fusion shaves; however, I have never done any cartridge shaving with good prep until now so it might make sense to back up and try them all.