I get duds every once in a while too (with the Lab Blue's).I'm still figuring this out.... but it really looks like the AccuForge blades are the replacement or new name for the Personna Lab Blues... and the AccuThrive blades are the Personna Med Prep blade used in hospitals, etc.
I do know this... I bought the German Personna blades.... I used or tried to use 2 of them....They were so rough on my face, I threw the rest of the 100 I bought out... I ended up buying 6 boxes of 100 each Personna Comfort Coated USA blades and they've been pretty good for me.... though I've had 2 duds from one of the boxes. That is sort of surprising but I know they were duds because when I replaced them, mid shave, the shave returned to the excellent shave the razor gives me normally.
The German ones are apparently nowhere near the USA made ones. I had the same experience. They're terrible!