I dumped my Mach 3 last month when I cut my top lip on the morning of my dental appointment and since I'm on Warfarin it was still bleeding when I sat in the dentist chair. I have noticed that the Mach 3 cart blades are now sharper than they used to be. That could be the root of your problem re. 2.5 passes.Mach3 (4)
Proraso green soap
Simpson special
Parera Varon Dandy lotion
Gillette moisturizer
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9/10, BBS. Everything is great but it seems like 2,5 passes are too much for me. It feels like I overshave... IMO carts are created only for one quick pass, maybe a few extra clean-ups and that's it.
After several shaves with carts, I got bored a little. I miss my Fatip Slant and DE blades. My wish to see how many shaves I can get with Mach3 cart is stronger though.
I used the Mach 3 for tidying up after a DE shave and I changed to Gillette Guard (ebay) which works for me. I am testing the Penny Shaver from AP Shave Co but re. sharpness it's out of the frying pan and into the fire.