Interesting. The more I see these differing experiences with Personnas, the more convinced I am that they vary substantially from batch to batch. Unlike a number of other blades, DE or SE, which are either (in my experience) consistently good, bad or average, I've found that these seem wildly variable.
I ditched the Chinese Schick, from a 3-spot setting, because it just didn't shave any whiskers off, even given 3 chances. I have some NOS Schicks, but I save those for my PAL and Schick vintage razors, so I hand-loaded a Personna and it worked well. Unfortunately I have no idea whether it was from a lot I already had, or from those sent with the Single Edge.
Perhaps I'll find my chain-mail gloves and start hacking DE blades about, like
@Blademonkey the Bold. Bring on the styptic and cotton-wool tufts!